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Ingredient Guide — why these rules
What gets flagged — and what the evidence actually says
Seed oils (canola, soybean, corn, sunflower, safflower)
FlavCity position: Generally rejects seed oils and characterizes them as inflammatory. (Canola and soybean were named by Bobby in a public interview; the broader category is confirmed in the app listing.)
Independent evidence: The American Heart Association recommends non-tropical unsaturated oils, including canola, soybean, corn, sunflower and safflower, in place of saturated fats. Omega-6 fats can participate in signaling pathways, but that does not establish that eating these oils causes chronic inflammation.
Limits: No app-specific inflammation outcome, dosage threshold, or direct causal gut-microbiome effect was verified.
Refined sugar, cane sugar and corn syrup
FlavCity position: Avoids refined sugars, even in a food otherwise viewed as nutritious. (Refined sugar and corn syrup named by Bobby; cane sugar flagged in a documented product scan.)
Independent evidence: Excess free-sugar intake can increase energy intake and dental-caries risk, and frequent high intakes can contribute to cardiometabolic problems. The WHO recommends free sugars below 10% of energy — 50 g/day on a 2,000 kcal diet — with further benefits at 5% or less.
Limits: Health implications depend on dose and the whole diet; small amounts do not make a food automatically unsafe.
Artificial sweeteners
FlavCity position: The app calls these “fake sugars” and flags the category. No complete named blacklist is publicly available.
Independent evidence: Studies of non-sugar sweeteners vary by sweetener, dose and population. The WHO advises against using non-sugar sweeteners as a long-term weight-control strategy.
Limits: Do not assign specific microbiome damage to aspartame, sucralose or other individual sweeteners without agent-specific evidence and verified app status.
Natural flavors and artificial flavors
FlavCity position: Prefers transparent, minimally processed ingredient lists without these label terms. Both categories are explicitly identified by the publisher; natural flavors were named by Bobby.
Independent evidence: No demonstrated general health outcome follows merely from the words “natural flavors” on a label. These broad terms do not alone establish toxicological harm.
Limits: The specific ingredients behind a flavor term, the exposure, and individual allergies matter; the app’s own explanatory text was not publicly recoverable.
Artificial food colors / dyes
FlavCity position: Avoids artificial colorings. The category is explicitly flagged; individual dye-by-dye status is not verified.
Independent evidence: The FDA reviews permitted colors for their intended uses and restrictions; Yellow 5 can rarely cause itching or hives.
Limits: Some dyes may cause sensitivity reactions in susceptible individuals; concerns about behavioral responses in some children are debated and compound-specific. A blanket claim that all food dyes cause hyperactivity or inflammation is not established, and regulatory status changes over time.
Preservatives and chemical additives
FlavCity position: Flags selected preservatives and chemical additives it considers undesirable. Both broad categories are confirmed in the app listing; specific compounds are not available as an exhaustive public list.
Independent evidence: Preservatives differ greatly in chemistry, exposure and function, and some protect against microbial spoilage — ingredient-by-ingredient toxicology is needed to assess risk.
Limits: No evidence supports treating all preservatives as one harmful substance, and no individual app footnotes were verified.
Ultra-processed products
FlavCity position: Favors minimally processed foods. (“Ultra-processed” describes processing patterns; this is a broader FlavCity preference, not a verified blanket app rule for every product.)
Independent evidence: A controlled feeding trial found greater energy intake and weight gain on an ultra-processed diet; a 2026 evidence synthesis noted uncertainty about processing independent of nutritional composition.
Limits: This is a dietary-pattern observation, not proof that every additive causes microbiome injury.
GMOs — not a verified flagged category
FlavCity position: Sometimes described in secondary summaries of FlavCity screening, but no first-party individual app classification was established in this audit, so GMOs are excluded from the verified flagged-ingredient list pending primary-source evidence.
Independent evidence: Genetic modification is a production method, not a single chemical exposure or mechanism; no adverse effect can be inferred from the label “GMO” alone.
Favored foods — benefits and evidence
Whole fruits and vegetables
FlavCity position: Emphasizes real, whole ingredients.
Potential benefits: Fiber, water, micronutrients and diverse plant compounds; fiber supports bowel function and microbial fermentation.
Independent evidence: The WHO recommends varied fruits and vegetables; AHA 2026 guidance endorses plenty of produce.
Limits: Benefits vary with quantity, variety and preparation; some individuals have allergies or digestive intolerance.
Whole grains and naturally occurring fiber
FlavCity position: Consistent with the preference for minimally processed foods.
Potential benefits: Fiber supports stool regularity and can contribute to satiety and gut microbial fermentation; whole grains provide nutrients.
Independent evidence: The WHO recommends at least 25 g/day of naturally occurring dietary fiber for people older than 10; the AHA recommends whole grains over refined grains.
Limits: Not all fibers have identical effects; rapid increases may cause bloating.
Beans, peas and lentils
FlavCity position: Consistent with the whole-food preference.
Potential benefits: Plant protein, fiber and minerals; can replace some higher-saturated-fat proteins.
Independent evidence: The AHA identifies beans, peas and lentils as healthier protein sources.
Limits: Fiber tolerance and preparation vary; kidney or other conditions can require individualized advice.
Olive oil
FlavCity position: Fits minimally processed and unsaturated-fat food choices.
Potential benefits: Mostly monounsaturated fat; replacing saturated fat can lower LDL cholesterol.
Independent evidence: The AHA includes olive oil among recommended liquid plant oils.
Limits: Calorie-dense; benefits relate substantially to replacement and the overall diet, not unlimited addition.
Avocado oil
FlavCity position: Consistent with unsaturated-fat choices.
Potential benefits: Predominantly monounsaturated fat, which can be a healthier substitution for saturated fat.
Independent evidence: The AHA identifies avocado oil as an option among healthy cooking oils.
Limits: Purity and processing vary; no unique clinical advantage over other unsaturated oils established here.
Nuts and seeds
FlavCity position: Whole-food source of fats and nutrients.
Potential benefits: Unsaturated fats, fiber and minerals; replacing saturated-fat foods may improve blood lipid profiles.
Independent evidence: The AHA recommends nuts and seeds as sources of unsaturated fats and protein.
Limits: Allergies, calories and added salt/sugar matter; whole seed foods should not be conflated with industrially processed seed oils.
Fish and other protein foods
FlavCity position: Fits whole-food dietary patterns.
Potential benefits: Protein supports tissue maintenance; fatty fish also supply omega-3 fats.
Independent evidence: The AHA recommends fatty fish and other healthy protein sources.
Limits: Mercury exposure, cooking method, allergies and portion size matter.
Minimally processed dietary patterns
FlavCity position: Prefers whole foods over ultra-processed products.
Potential benefits: May improve satiety and reduce passive overconsumption when foods are fiber-rich and less energy dense.
Independent evidence: AHA guidance favors minimally processed foods; a controlled feeding trial found increased intake on an ultra-processed diet.
Limits: No single ingredient guarantees a health benefit, and processed foods can still be nutritionally useful. Dose, substitution, dietary pattern, allergies, processing and individual needs all matter.
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