Take the Apple: Why I Don't Eat Fruit
Sugar, antinutrients, pesticides: what a biochemical examination leaves of the apple's health myth.
Editor’s note: Originally written in German. Sources and regulatory references are predominantly from German state agencies and reflect the German/EU context; institutional names are retained in German, with brief clarifications.
Is fruit healthy? I don’t think so.
This is a draft of a narrative opinion piece and not a paper by scientific standards. Even though the argument is scientifically grounded on all the decisive points. As for the presence of the constituents in apples, no one is likely to seriously dispute that.
I largely avoid plant-based food. And when it does occasionally make it in, it’s things I know reasonably well won’t cause me any particular problems in occasional consumption. Thanks to my highly restricted diet (mainly meat, eggs, fish, some dairy), I can by now identify disruptive factors quite well — and eliminate them right away.
I’ve never particularly enjoyed most fruit, and with apples in particular I could feel right away that they didn’t sit well with me. Now I can guess why my digestive system was always against apples and why I had this instinctive aversion. For decades, however, even I failed to put two and two together and think clearly. I too had simply parroted what passed for common sense. If you aren’t even capable of hearing and understanding what your own body is telling you … well, then you’re clearly in some kind of dysfunctional relationship with everything.
In the end, this analysis applies more or less across the board to any plant food. The apple is a symbolically charged fruit (even myths about poisoned apples aren’t all that far from biological reality, as we’ll see below). The simplistic saying “An apple a day keeps the doctor away” is practically screaming for a thorough debunking. The apple is a typical, almost ubiquitous fruit in our latitudes and is anchored in cultural traditions (though strictly speaking a neophyte). So I simply picked the apple. Even though, as I’ll return to in the final section, it isn’t even the best example of how plant food rather quickly loses its mystique under critical scrutiny.
Another point I’ll largely set aside here is that the apple, while not native to Germany, has somehow become naturalized. That is to say, devastating monocultures and ecological disasters, as well as the global transport logistics of other fruit and vegetable varieties, don’t even apply to it. But that’s for another day…
To get concrete and put the decisive points up front: I see no reason ever to eat an apple. Nutrition is, at its root, a biochemical matter. Not an ethical, religious, or political one. So what needs clarifying, above all, are the physiological aspects. What we need as food, meaning what we must consume, are — besides water — three main groups: fats and proteins as macronutrients (in relatively large amounts), and, among other things, various vitamins and minerals as micronutrients (in relatively small amounts). Carbohydrates in any form, or sugar (carbohydrates consist of nothing else), are not required. On the contrary, once consumed beyond the amount the body itself generates precisely on demand via gluconeogenesis, they tend to be harmful (unless the organism has individual peculiarities that shift these signs a little).
This is established biochemistry — there’s no serious biochemical dispute to be had about it, even though nutrition guidelines stubbornly ignore this point and it is politically inconvenient within nutrition policy. The Food and Nutrition Board of the National Academies of Sciences — the U.S. body that has scientifically grounded the official American dietary recommendations since 1940 and sets the Recommended Daily Allowances — formulated this unequivocally as early as 2005:
“The lower limit of dietary carbohydrate compatible with life apparently is zero, provided that adequate amounts of protein and fat are consumed.” (National Academies Press, 2005, p. 275)
I’ll leave it at that for now. But I want to make my position clear: anyone who, for example, presents themselves as a nutrition expert and doesn’t know and/or ignores this fact is not qualified for this job.
It should also be noted that the quality of fats and proteins, as well as the form of the micronutrients (e.g., heme iron), matters. Animal food sources provide, for many critical nutrients (complete proteins, heme iron, zinc, vitamin B12, fat-soluble vitamins), a markedly higher bioavailability and density than most plant-based alternatives. In my assessment, this advantage clearly outweighs the antinutritive factors and toxin profiles of many plants, which I discuss in more detail elsewhere.
In what follows, we’ll first look at what an apple consists of. And with that, we get straight to the heart of the whole matter here. 85% water: I don’t need an apple to take in water. 15% carbohydrates/sugar: I don’t want them, I don’t need them, they harm me. Fiber is considered indispensable — the opposite is well supported, and those who cut out the indigestible plant fibers often notice surprisingly quickly that they don’t miss them at all. For many people, they aren’t a gain at all anyway but a disruptive factor — that sounds provocative but is physiologically justifiable. More on that elsewhere.
Well, and up to this point we’re already at nearly 100% apple that I don’t need, don’t want, and that harms me. The rest, the micros, as we’ll see, isn’t particularly worth mentioning either. I don’t need an apple for that, and certainly no other plant food. And now further caveats: there are also plenty of antinutrients and toxins in there. Plus problems arising from industrial production and processing.
In my view, then, it becomes immediately clear that the “healthy apple” thesis is quite a stretch: nutrient density in the minimal range, the nutrients that are present are middling, and the risks are demonstrably on the table.
The rest of the article I’ve structured in part as a dialogue. The basis was originally an AI dialogue (essentially Perplexity and Claude), which I’ve heavily condensed. Only then did I decide to turn it into an article. I find the question-and-answer format didactically useful and it takes the reader along. I hope you see it that way too :)
Question: What does an apple actually consist of?
The chemical composition of a typical apple per 100 g fresh weight — average values, varying slightly by variety and storage:
Water: 84–86 g
Carbohydrates: 10–18 g total · glucose 1.5–2.5 g · fructose 5–7 g · sucrose 2–4 g · starch 0.1–0.5 g · fiber 2–3 g
Protein and fat: crude protein 0.2–0.4 g · fat 0.1–0.4 g
Minerals: 0.3–0.5 g total · potassium 100–130 mg · phosphorus 10–15 mg · magnesium 5–8 mg · calcium 5–10 mg · iron 0.1–0.2 mg
Vitamins: vitamin C 4–14 mg · vitamin E 0.2 mg · vitamin K 2–3 µg · B vitamins (B1, B2, B6) each <0.1 mg
Organic acids: 0.4–0.8 g total · malic acid 300–600 mg · quinic acid 50–100 mg · citric acid 20–50 mg
Polyphenols / flavonoids: chlorogenic acid 10–50 mg · quercetin glycosides 5–20 mg · epicatechin 5–10 mg · procyanidins 20–100 mg · phloretin glycosides 1–5 mg
Aroma compounds: (traces, µg range) esters 100–500 µg · aldehydes 10–50 µg · alcohols 5–20 µg
Antinutrients / residues: polyphenols/tannins (inhibit mineral absorption) · patulin (mycotoxin, limit in juice 50 µg/kg) · pesticides (conventional cultivation, typically 0.01–1 mg/kg)
On the micronutrient side, the apple is average: it mainly provides low to moderate amounts of vitamin C and potassium, but stands out neither as a particularly dense nor as an essential micronutrient carrier. Typical values are around 10–20 mg vitamin C and roughly 100–130 mg potassium per 100 g, while fat-soluble vitamins (A, D, E, K) and B vitamins occur only in trace amounts and clearly fall behind many vegetables, berries, or herbs.
Its actual “specialty” lies in the realm of polyphenols: quercetin glycosides, procyanidins, epicatechin, chlorogenic acid, and phloretin glycosides occur in the double-digit mg range per 100 g, with higher concentrations in the peel and in old or cider varieties. These very classes of substances are simultaneously described in the specialist literature as antinutritive, because they bind, in particular, non-heme iron and other minerals via complex formation and demonstrably inhibit their absorption in the gut; for quercetin at least, this effect is experimentally well established in animal and in vitro models. Compared to other plant foods, the apple thus stands as follows: rather average on classic vitamins and minerals, conspicuous on polyphenols — whose potential benefit, from my perspective, is significantly relativized by their antinutritive effect.
Question: What antinutrients and phytotoxins does it contain — and what else is of concern?
Apples contain natural antinutrients such as polyphenols, which belong to the secondary plant compounds. They have antioxidant effects but can also qualify as antinutrients because they inhibit the absorption of certain minerals. In fact, it is well documented in the specialist literature that antinutrients such as polyphenols and phytic acid, under typical experimental conditions, measurably inhibit the absorption of certain minerals (e.g., non-heme iron, zinc, calcium) and, in part, also of vitamins; this effect on bioavailability is considered an established phenomenon in nutrition science, even if the extent in individual cases depends on the overall meal context.
The LfL presentation on apple constituents lists in detail polyphenols such as chlorogenic acid, procyanidins, flavonols (e.g., quercetin glycosides), and dihydrochalcones (phloretin or phloridzin glycosides) as typical constituents of apple peel and flesh. These substances belong to the polyphenols known in nutrition science as antinutritive (complex formation with proteins and minerals). Review articles on polyphenols explicitly describe that polyphenols/tannins bind minerals (e.g., iron, zinc, calcium) and lower their bioavailability. Since precisely such polyphenols (chlorogenic acid, quercetin glycosides, procyanidins) are documented in apples, the antinutrient effect is not theoretical but biochemically well established.
Further substances of concern in connection with apples can be allergens, especially in people with birch pollen allergy, since certain apple proteins can trigger cross-reactions. The LfL Bayern states, in essence, that roughly one in twenty people in Germany has problems, to varying degrees, with apple consumption (apple allergy, cross-reactions, etc.). This shows: even in a mainstream-adjacent, agriculture-related context, it is acknowledged that apple consumption is not harmless for a relevant share of the population.
But fair enough: the extent of the harm depends strongly on the overall setting, including individual iron and mineral stores and the total amount of other antinutrients in the meal. Whether the antinutrients from the apple carry practical weight depends heavily on the context of the rest of the meal: heme iron from meat uses different transport pathways and is significantly less sensitive to polyphenols than plant-based non-heme iron, and vitamin C can increase the absorption of non-heme iron in ways that partially offset the inhibitory effects of polyphenols. For patulin, there are binding limits for products (e.g., 50 µg/kg in juice), but not “per apple/day” for consumers; whether critical amounts are reached depends on the quality/storage of the fruit and on the share of processed products. So one can’t say from how many apples within what time frame it becomes how critical for whom.
Phytotoxins such as the mycotoxin patulin can occur in rotten apples infected by mold fungi, especially when the fungus Penicillium expansum is involved. Patulin is heat-stable and of health concern, which is why affected parts of the apple should be generously removed.
Question: But I don’t eat rotten apples. Does that make me safe?
Authorities and specialist bodies explicitly emphasize that partially rotten windfall apples are a main source of patulin when processed into juice, purée, or concentrate. The LGL Bayern writes that even small amounts of moldy apples are sufficient to contaminate large quantities of apple juice up to or above the EU limit of 50 µg/kg. A Lower Saxony investigation found, among 120 apple juices, 3 samples above the limit of 50 µg/kg, one of them extreme at 1,429 µg/kg. Specialist reports and reviews on patulin in apple products show that a relevant share of apple juices display measurable patulin contents and that limits have therefore been regulatorily set (typically 50 µg/kg for juice, 10 µg/kg for infant products).
Patulin arises primarily in rotten spots due to mold fungi and, in soft apples, spreads into the healthy flesh (up to 1–2 g/kg in rot spots). In firm apples it usually stays local; generously removing rotten parts minimizes the risk.
In short: regarding industrial processing, the argument doesn’t hold up, because even a few rotten fruits in the raw material pool are enough to measurably contaminate entire juice batches — despite sorting measures and limits. At least one scientific review expressly calls patulin contamination in apple products a global problem for which no satisfactory solution exists to date (Zhong et al., 2018).
Question: How intensive is pesticide use in apple cultivation?
Pesticide use in apple cultivation in Germany is very intensive. Frequently used active ingredients include fungicides such as captan and dithianon, as well as the herbicide glyphosate and insecticides such as chlorantraniliprole. These substances can leave residues in the apple, some of which are classified as possibly carcinogenic or environmentally harmful. The apple is among the fruits with the highest number of different pesticide residues in consumer tests (cf. Umweltinstitut München).
Pesticides sit mainly on the peel but partly penetrate into the flesh (up to 0.03 mm deep). Simple washing removes only superficial residues; a baking soda solution (15 min.) or peeling reduces them more effectively but doesn’t remove everything (4–20% remain in the flesh).
After harvest, apples are often surface-treated, which serves as “preservation” or protection against spoilage and drying out. Common procedures include wax coatings (e.g., beeswax, carnauba wax, paraffin, or synthetic waxes), which reduce moisture loss and impart gloss. This layer can trap pesticide residues or dirt and hinders thorough washing. Synthetic waxes are in part controversial because of residues and environmental aspects. In some countries, additional antifungal agents such as fungicidal sprays or treatments (captan, imazalil) are used to prevent mold growth.
This process is problematic because it can trap chemical residues through the waxes, is in part difficult to wash off, and can mislead consumers regarding the ‘purity’ of the fruit. The wax and antifungal agents increase the pesticide cocktail, which can pose a risk for sensitive individuals or at high intake.
Question: Does the micronutrient profile contain anything that is not present in animal foods and that I’d be missing on a carnivore diet?
Apples contain phloridzin (phloretin glycoside) and phloretin, flavonoids that occur exclusively in apples and are absent from animal foods. These substances are localized in the peel and flesh, with concentrations of 1–5 mg/100 g for phloretin glycosides. Further plant-specific compounds such as quercetin glycosides (5–20 mg/100 g) and chlorogenic acid (10–50 mg/100 g) are not naturally present in animal products.
Animal foods mainly provide vitamins (B12, D, A as retinol), minerals (iron as heme iron), and no plant polyphenols. Apples, on the other hand, offer a matrix of flavonoids, phenolic acids, and organic acids (e.g., malic acid) that animal products do not replicate. These secondary plant compounds are exclusively plant-based and vary by variety (higher in old varieties).
Phloridzin inhibits glucose reabsorption in the gut, an effect without animal equivalent. The combination of these substances with pectin and aroma volatiles creates a plant-based profile for smell, texture, and acid balance that animal foods do not offer. If sugar/fiber are to be avoided, distilled apple cider vinegar or extracts (e.g., ApplePhenon with >70% OPC) could be an option to isolate only the micro components.
Question: As a practically sugar-free carnivore, what do I gain from the glucose reabsorption inhibition by phloridzin?
As a practically sugar-free carnivore, I gain no relevant benefit from the glucose reabsorption inhibition by phloridzin (an SGLT1 inhibitor in the gut). My diet already provides no or minimal glucose from carbohydrate-free animal sources, so no sugar uptake needs to be blocked — blood sugar remains stable without intervention.
The effect is primarily relevant for carbohydrate-rich diets, e.g., in diabetes to reduce postprandial glucose peaks or cravings, which is irrelevant on carnivore. Studies show effects only in glucose-loaded models (e.g., STZ diabetes mice), not in low-carbohydrate states.
Phloridzin could even be counterproductive, since it promotes caloric reduction and increased renal glucose excretion, which with zero sugar input would be unnecessary or burdensome.
Question: Does the body actually need any of this?
No. None of the micronutrients contained in apples (such as flavonoids, phenolic acids, or phloridzin) is essential or strictly required, since they are absent from animal foods but don’t need to be substituted by other sources or at all. Fiber, sugar, pesticides, and potential antinutrients clearly outweigh in the risk-benefit assessment — which, in my view, justifies a contra-apple conclusion.
Question: Why are apples nevertheless promoted as unreservedly healthy?
Many sources and public narratives present apples as healthy, based on their content of vitamins, fiber, and secondary plant compounds. These narratives are widely communicated and part of recommendations for a balanced diet. But these narratives are hardly questioned.
The systematic analysis in this document focuses on the actual essential nutrient necessity, the ratio of undesirable substances (sugar, pesticides, antinutrients), and the real benefit of the micronutrients. This sober assessment pattern shows that the widespread health myth surrounding the apple is not automatically transferable to individual needs and contexts, especially not with dietary forms such as the carnivore diet. Moreover, the categorization “fruit = healthy” usually occurs without qualified definition; health-problematic aspects, although documented even in mainstream sources, are seldom systematically set against it. Yet such critical juxtapositions are precisely what’s needed to enable differentiated dietary decisions that go beyond blanket health recommendations.
Question: Is an apple, as it is marketed today, even still a real natural product? From what I know, for decades at least we’ve been dealing with selections and breeds that have little in common with the original forms. Cultivation is industrial, and the nutrient composition does not correspond to anything we ever encountered and consumed in nature over the course of our evolutionary history.
An apple as sold today is historically and genetically clearly not a “natural state,” but the result of millennia of domestication, modern breeding, and industrial cultivation.
Genetically, the cultivated apple traces back to wild apples such as Malus sieversii from Central Asia; today’s varieties, however, are hybrid products of several Malus species and have been deliberately selected over many generations for large fruit size, high sugar content, lower acidity, fewer bitter substances, and lower polyphenol content. Studies show that modern cultivated varieties on average have significantly less acid and up to roughly two-thirds fewer phenols than their wild ancestors — that is, precisely the profiles we never encountered in this form in free nature over the course of our evolutionary history. In parallel, cultivation is heavily industrialized: large-scale monocultures in a few main regions, high-performance rootstocks, intensive plant protection, and storage technology shape a product that, in yield, appearance, storability, and nutrient composition, massively deviates from historically “natural” wild apples and earlier landscape forms.
Compared to many other plant foods (e.g., nightshades, raw legumes, or highly oxalate-rich leafy greens), the content of classic, strongly toxic phytotoxins in the apple is rather moderate — which, within plant food, makes it almost a “more harmless” variant for me. That’s precisely why I deliberately use it as a model: if even with the comparatively mild apple what’s left on balance is mainly sugar, antinutritive polyphenols, possible mycotoxins, and a documented pesticide cocktail, I see no reason to fall back on “varied fruit consumption” — other fruits, or plant food as a whole, tend to exacerbate many of these problems rather than solve them.
References
Foundations / Biochemistry
National Academies of Sciences, Engineering, and Medicine (2005) – Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press, Washington DC.
Contains on p. 275 the statement that the lower limit of dietary carbohydrate intake compatible with life is zero, provided that adequate amounts of protein and fat are consumed. https://doi.org/10.17226/10490
Polyphenols / secondary plant compounds / composition
LfL Bayern – Inhaltsstoffe des Apfels
Documents water, sugar, acid, vitamin, and polyphenol contents (quercetin glycosides, procyanidins, phloretin glycosides, etc.), as well as the note that polyphenols are the most important secondary constituents of the apple. Also contains the statement that one in twenty people in Germany has problems with apple consumption (apple allergy). https://www.lfl.bayern.de/mam/cms07/iab/dateien/streuobsttagung_2018_vortrag_h%C3%B6hne.pdf
BUND Lemgo – Inhaltsstoffe des Apfels (Teil 1)
Detailed tabular listing of primary and secondary constituents (sugars, acids, polyphenols) in various varieties. https://www.bund-lemgo.de/download/FB_2012_05_Inhaltsstoffe_des_Apfels_-_717.pdf
Antinutrient properties (polyphenols, quercetin, etc.)
Vitalstofflexikon – Eisen / Interaktionen
Polyphenols/tannins as inhibitors of non-heme iron absorption via complex formation. https://www.vitalstoff-lexikon.de/Spurenelemente/Eisen/Interaktionen
Quercetin and iron absorption — human/in vitro data
Quercetin inhibits intestinal non-heme iron absorption and ferroportin expression. https://pmc.ncbi.nlm.nih.gov/articles/PMC6437293/ and https://www.springermedizin.de/quercetin-inhibits-intestinal-non-haem-iron-absorption-by-regula/15574648
Patulin (mycotoxin / mold toxin)
Verbraucherportal Bayern – Patulin
Basics on patulin in apples and apple products, toxicological assessment, EU limits (e.g., 50 µg/kg in juice, lower values for infant food). https://www.vis.bayern.de/essen_trinken/unerwuenschte_stoffe/patulin.htm
LGL Bayern – Patulin in Lebensmitteln
Spread of patulin in rotten apple sections, note that the toxin can also diffuse into the seemingly healthy flesh. https://www.lgl.bayern.de/lebensmittel/chemie/schimmelpilzgifte/patulin/index.htm
LAVES Niedersachsen – Patulin in Äpfeln und Apfelerzeugnissen
Analysis results on patulin in apples and processed products (apple juice), including samples exceeding the limit. https://www.laves.niedersachsen.de/startseite/lebensmittel/ruckstande_verunreingungen/patulin-in-apfeln-und-apfelerzeugnissen-151086.html
Zhong L, Carere J, Lu Z, Lu F, Zhou T (2018) – Patulin in Apples and Apple-Based Food Products: The Burdens and the Mitigation Strategies
Scientific review on occurrence, formation, stability, and levels of patulin in apples and apple products; describes patulin contamination as a global problem without satisfactory solution. https://pmc.ncbi.nlm.nih.gov/articles/PMC6267208/
Wikipedia – Patulin (overview only)
Brief overview of patulin as a mycotoxin in pome fruits, toxic properties. https://de.wikipedia.org/wiki/Patulin
Pesticides in apple cultivation / residues
Umweltinstitut München – Pestizide im Apfelanbau
Description of intensive pesticide use in apple cultivation (multiple sprayings per season), examples of active ingredients, the problem of cocktail effects. https://umweltinstitut.org/landwirtschaft/pestizide-im-apfelanbau/
Umweltinstitut München – Bericht Apfelmessungen (PDF)
Measurement data on pesticide residues in apples (number of active ingredients per sample, concentrations, organic vs. conventional). https://umweltinstitut.org/wp-content/uploads/2024/11/Bericht_Apfelmessungen_11-2024-Umweltinstitut-Muenchen.pdf
LAVES Niedersachsen – Rückstände von Pflanzenschutzmitteln in Äpfeln
Official state investigation: share of samples with residues, frequently detected active ingredients (e.g., captan), number of active ingredients per sample. https://www.laves.niedersachsen.de/startseite/lebensmittel/ruckstande_verunreinigungen/ruckstande_von_pflanzenschutzmitteln/apfel-knackig-rund-und-frei-von-pflanzenschutzmittelruckstanden-239545.html
Greenpeace / WiWo – 90% der deutschen Äpfel mit Pestiziden belastet
Test evaluation: high share of samples with multiple pesticide residues, including active ingredients partly classified as particularly problematic. https://www.wiwo.de/technologie/umwelt/greenpeace-test-90-prozent-der-deutschen-aepfel-mit-pestiziden-belastet/12477848.html
Additional sources on the natural-product / breeding aspect
New Insight into the History of Domesticated Apple
Genetic and historical analysis: the cultivated apple is a domestication product of wild species (mainly Malus sieversii) with a long breeding history, not a “natural state.” https://pmc.ncbi.nlm.nih.gov/articles/PMC3349737/
The domestication and evolutionary ecology of apples
Review on domestication, selection, and ecological adaptation of the apple; shows, among other things, the transition from wild forms to today’s cultivated varieties and their altered trait profiles (size, taste, etc.). https://edepot.wur.nl/287886
Phenotypic divergence between the cultivated apple (Malus domestica) and its primary wild progenitor (Malus sieversii)
Comparative study: documents clear differences between wild and cultivated varieties (size, sugar, acid, polyphenols, among others) and thus the strong breeding-driven shift relative to the original forms. https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0250751
Traditional, Indigenous Apple Varieties, a Fruit with a Future
Shows that traditional/indigenous varieties mostly have higher polyphenol contents and different nutrient profiles than modern standard varieties — an indication of strong breeding-driven changes in today’s commercial apple. https://pmc.ncbi.nlm.nih.gov/articles/PMC7022233/
The roadmap of apple taste improvement
Specialist article on the targeted sensory “improvement” of apples (sugars, acids, aroma compounds) through modern breeding; documents the deliberate intervention in composition and sensory profile. https://www.nature.com/articles/s43016-021-00311-y
Advances in apple breeding for enhanced fruit quality and storability
Overview of modern apple breeding with a focus on fruit quality, yield, storability, and disease resistance; underscores the industrially optimized character of today’s cultivated varieties. https://www.inhort.pl/files/journal_pdf/journal_2004spec2/full2004-1Aspec.pdf
Efficiency and Technology Gap in European Apple Production
Analysis of European apple production showing how strongly production and the value chain are industrialized, technologized, and shaped by high-performance systems. https://literatur.thuenen.de/digbib_extern/dn069688.pdf
Other technical references
R-Biopharm – Patulin (Analytik)
Specialist information on the analytics of patulin, toxicological classification (genotoxic, possible carcinogen). https://food.r-biopharm.com/de/analyten/mykotoxine/patulin/