How does your body lose weight? An obesity doctor explains why one size doesn’t fit all in weight loss

Your body adjusts your food intake and activity to maintain a balanced weight and avoid starvation. Researchers have proposed several theories explaining how this works.

By: Kim Pfotenhauer, Michigan State University, The Conversation

Outlets: The Conversation

Published: May 22, 2026

Words: 1,444

Last Updated: 2 months ago

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By Kim Pfotenhauer, Michigan State University

For decades, people have been told that their weight problems can be solved by math: Calories in, calories out. If weight were a simple math equation, more people would likely be the weight they desire. But it is much more complicated.

There are several theories as to why it is difficult to lose weight. Some focus on genetics and metabolism while others claim environmental and social factors …

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