Celeb Diets: Before and After

renee zellweger weight loss

Renee Zellweger

Renee Zellweger is famous for gaining and losing weight for movie roles (remember “Bridget Jones’ Diary”?). However, going up and down in weight can effect your health long term, Andersen says. “Each time you lose weight you run the risk of losing muscle,” he says.

If you’re starving yourself on a crash diet, then your body goes into starvation mode and will use your muscles for energy, Andersen says. Over time this can even hurt your heart and immune system. Your best bet: figure out your healthy weight and do your best to stay in that zone, no more yo-yo-ing.