Library.

“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.

“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.