During the body during the first week you may find it easy to lose weight by simply switching to a healthier diet but as your metabolism adjusts you won't burn as many calories as you used to so losing additional weight will become harder making matters worse as the fat melts away you'll start to experience an increase in appetite after a meal fat cells release a hormone called leptin into the bloodstreem this surge in leptin level signals to your brain.
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From @kanizkhan