It refers to the thousands of chemical reactions that turn what we eat and drink into fuel in every cell of the body. These reactions change in response to our environments and behaviors, and in ways we have little control over. 

Metabolism is not a single thing that can be calibr...

• Basal metabolism is the energy our body needs to keep our cells working and accounts for 65-80% of most adults' caloric consumption.
• The thermic effect of food is the energy our body uses to process food and accounts for 10% of most adults' caloric consumption.
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Not everyone overeats and becomes overweight, and not everyone who becomes overweight or obese develops illnesses like diabetes or heart disease. 

There was never a special diet, exercise regimen, or supplement that worked universally to control weight. Through trial and error, we...

• A caloric deficit leads us to unknowingly compensate by eating more.
• For some, crash dieting can permanently slow their metabolic rate, leading to longer calorie retention.
• Bodies don’t burn more body fat while on a high-fat and low-carb ketogenic diet, compared to a higher-c...

• A diet that universally leads to healthy weight loss.
• Why two people with the same size and body composition have different metabolic rates.
• Why some ethnic groups — African Americans, South Asians — have a higher risk of developing metabolic disorders like diabetes.
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