Intentional weight loss is the loss of total body mass as a result of efforts to improve fitness and health, or to change appearance through slimming. Weight loss in individuals who are overweight or obese can reduce health risks,[1] increase fitness,[2] and may delay the onset of diabetes.[1] It could reduce pain and increase movement in people with osteoarthritis of the knee.[2] Weight loss can lead to a reduction in hypertension (high blood pressure), however whether this reduces hypertension-related harm is unclear.[1][not in citation given]

Even if you manage to meet your goal, it probably won’t be sustainable: “The amount of restriction required will make you so hungry that you’ll eat everything in sight—it’s survival instinct,” Dr. Seltzer says. What’s more, your body will be less prepared to burn the foods you binge on, since calorie restriction gradually slows your metabolism, he adds.

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