Keto. High protein. Intermittent fasting. So many diets claim to be the best way to lose weight. But do diets actually work? Research shows that diets don’t lead to long-term weight loss for most people, and that even two people following the same “healthy” diet can have wildly different results. Stanford University nutrition professor Dr. Christopher Gardner has spent more than 20 years studying nutrition and comparing different diets. He spoke to CNN’s Chief Medical Correspondent Dr. Sanjay Gupta to share what he’s learned and shares his tips for personalizing the way you eat to fit your body’s needs. 
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