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When someone wants to lose weight, it is advisable to introduce an ( energy deficit, energy increase ). The ( NASM, ACSM, Active IQ, NABBA ) advise this to be no more than ( 100, 400, 500, 750, 1000 ) calories per day. This can come from diet restriction on its own or from exercise and diet together. This promotes safe weight loss of ( 1lb, 10lb, 2lb ) per week.