Passage Summary: People used to think eating simple carbs instead of fat was a good way to stay thin, but it turns out those carbs can trigger a hormone that turns extra sugar into body fat anyway.

Reasoning: Simple carbohydrates trigger insulin, which converts excess energy into body fat, casting doubt on the idea that these carbs are a safe substitute for fatty foods.

Analysis: This stimulus provides a biological mechanism to explain why a common dietary belief might be wrong. If simple carbohydrates stimulate insulin, and insulin stores by-products as fat when energy isn't needed, then eating simple carbs can lead to fat gain. We should look for an answer that synthesizes these facts—likely something suggesting that a high intake of simple carbohydrates can result in increased body fat for many people. Avoid any answer choices that make broad claims about 'all' people or 'all' carbohydrates, as the stimulus specifies 'many' and 'simple' carbs.