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Anonymous
more energy (calories) your body burns to keep you alive. This is called your basal (or basic) metabolic rate. A lot of factors go into it, including genetics, but for most adults 1,700 to 2,200 calories a day is their rate. This is why most foods are "based on a 2,000 calorie diet".
So, if you laid in bed all day without doing a damn thing, you'd still go through roughly 1.800 calories or so.
As your weight decreases, so too does your BMR. This means that the less you weigh, the harder it is to lose weight. This is where exercise comes in.
A year ago I weighed 260lbs. I had a BMR of 2,550 calories a day. I cut my diet down to 1,400 calories a day, and I lost about 60 lbs over six months. When I hit 200, I started incorporating exercise into my weight loss routine, and another 50lbs slid right off in a matter of six more months. However, if I hadn't changed my routine and was still "passively dieting" (sedentary lifestyle, just eat low calorie foods), I would probably still be 180 - 190 lbs.
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