Browse evidence-based analysis of health-related claims and assertions
A plant-derived chemical from a South American tree shows promise in protecting eye cells from oxygen-starvation damage, hinting it might help with brain injuries too.
Descriptive
This compound only works if you give it at just the right amount—too little or too much doesn’t help, so getting the dose exactly right is super important.
Quantitative
If you give too much of this compound, it starts killing eye cells instead of helping them—typical of many natural substances that have a narrow safe range.
This compound can help eye cells survive short-term oxygen loss, but loses its power if the stress lasts too long.
This compound works best at one very specific dose—too little does nothing, too much hurts—and scientists can predict this pattern very accurately with math.
This compound helps eye cells make more of a natural 'clean-up' enzyme that fights harmful chemicals, but only if given early after stress begins.
Mechanistic
At the right dose, this compound can reduce harmful stress molecules in eye cells—but only if given right after the stress starts, not later.
A natural compound called Brosimine B helps retinal cells survive better at a very specific low dose, but hurts them if you give too much.
Maximum human lifespan potential is approximately 120 years, yet average lifespan in optimal dietary environments remains significantly lower, suggesting non-dietary factors limit longevity.
Assertion
Improvements in health biomarkers following increased vegetable intake are confounded by concomitant reduction in processed food consumption.
Consumption of modern, selectively bred fruits and vegetables is associated with improved health outcomes in human populations.
The hypothesis that low-dose plant-derived phytochemicals confer health benefits via antioxidant or hormetic mechanisms lacks empirical validation in human studies.
Complete elimination of dietary fiber from plant sources can resolve symptoms of chronic constipation, including infrequent bowel movements, bloating, straining, abdominal pain, and anal bleeding.
Lectins are plant-derived proteins that can translocate across the intestinal barrier, bind to mammalian tissues, and trigger inflammatory or autoimmune responses in susceptible individuals.
Oxalates are plant-derived compounds that can bind with calcium in the kidneys to form calcium oxalate kidney stones.
The hormetic dose-response curve for plant-derived phytochemicals in humans is undefined, with no established thresholds for beneficial versus harmful effects.
Selective breeding of plants creates novel genetic combinations but does not eliminate their inherent production of defensive phytochemicals.
Animals do not produce phytochemical-like defensive toxins because their primary defense mechanisms are physical (e.g., speed, strength, biting), not chemical.
Wild, unmodified plant species are generally unpalatable to humans due to high concentrations of defensive compounds, limiting their consumption without processing or selective breeding.
The bitter taste of many plant foods is a direct result of the presence of defensive phytochemicals that deter herbivory.
Plants produce a variety of natural chemical compounds as defensive mechanisms against herbivores and pathogens.
Modern broccoli takes almost two months less to grow than sprouting broccoli, which means farmers can harvest it quicker and plant more crops per year.
Purple cauliflower has more perfectly uniform florets than modern broccoli — a trait breeders might want to copy into broccoli to make it look better.
The DNA of modern broccoli has more A and T building blocks than older types — a pattern also seen in corn and soybeans, likely from long-term breeding.