Weight loss is a complex and emotive process, with many factors at play that can impact results. And keeping the weight off can be even harder.

“Biologically, our bodies are designed to defend against losing weight,” says Dr Rachel Woods , a senior lecturer in physiology at the University of Lincoln in the U.K.

“When we reduce calorie intake, the body responds by slowing metabolism and increasing hunger signals, essentially trying to conserve energy,” says Woods, who has spent nearly 15 years working in and around health and nutrition research. “This makes sustaining weight loss very difficult. You may like

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