Humans with normal metabolism have a built-in mechanism to regulate fat mass using the hormone leptin.
Most people who are overweight these days are overweight because they are insulin resistant, caused by large amount of processed foods and sugar. The insulin resistance gets in the way of fat metabolism and messes up the leptin regulation of hunger.
Those who think that you just need to eat less are likely insulin sensitive, and if you are insulin sensitive and clean up your diet a bit, you will lose weight.
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