Library.

“Insulin therapy causes weight gain in people with diabetes.”

Clinical evidence consistently identifies insulin therapy as a common cause of weight gain in diabetes. Major guidelines and reviews describe several mechanisms, including reduced calorie loss in urine, anabolic effects, and compensatory eating to avoid hypoglycemia. The effect is not inevitable, and its size varies by regimen and lifestyle, but those caveats do not change the main conclusion.

“Type 2 diabetes is often preventable.”

Authoritative medical evidence supports this claim. Major health bodies state that type 2 diabetes can often be prevented or delayed, particularly in people at higher risk, through lifestyle changes such as healthier eating, regular physical activity, and weight loss. The claim does not imply every case is preventable, and that limitation is consistent with the evidence.

“Aretaeus of Cappadocia produced systematic clinical descriptions of diseases, including diabetes, epilepsy, and mental disorders, based on direct observation of patients.”

The historical record broadly supports this description of Aretaeus. Scholarly sources credit him with systematic clinical accounts of diabetes, epilepsy, and mental disorders, and they indicate that his work drew on direct clinical observation. The key caveat is that his treatises also synthesized earlier Greek medicine, and explicit evidence for direct observation is strongest for diabetes rather than equally documented for every condition listed.

“Insulin resistance prevents fat loss in humans.”

The absolute claim that insulin resistance "prevents" fat loss is not supported by the evidence. High-authority mechanistic studies show insulin resistance preserves antilipolytic signaling, making fat loss harder — but multiple clinical studies demonstrate that insulin-resistant individuals do lose fat through caloric restriction and exercise, sometimes at rates equal to or exceeding non-insulin-resistant groups. The accurate statement is that insulin resistance impedes or complicates fat loss, not that it categorically blocks it.

“Living at high altitude provides protection against developing diabetes.”

Multiple studies do find a statistical association between living at higher altitudes and lower diabetes prevalence, and a 2026 Cell Metabolism study identified a plausible mechanism in mice (red blood cells absorbing more glucose under low-oxygen conditions). However, the key human evidence is cross-sectional — it cannot prove causation. Some studies in high-altitude populations actually found higher diabetes risk, and the scientific community considers the question still debated. The claim's language — "provides protection" — overstates what the evidence currently supports.

“Consumption of processed food causes insulin resistance.”

The claim is directionally accurate but overstated. Multiple peer-reviewed studies, mechanistic reviews, and clinical guidance consistently link ultra-processed food consumption to insulin resistance markers. However, most evidence uses associative language ("linked to," "associated with"), not definitive causal proof. Key confounders — obesity, sedentary lifestyle, and overall diet quality — remain inadequately separated from the independent effect of processing. The claim also says "processed food" broadly, while the evidence specifically addresses "ultra-processed foods," a narrower category. The relationship is strong and biologically plausible, but the word "causes" goes beyond what current science has firmly established.