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There are definitely differences in metabolism between individuals, but the above stats should hold true. It's just that your maintenance calorie count is probably higher than mine, IE you can eat more and still not gain weight than me. Your maintenance calorie count also changes with your weight. I could keep my weight at a steady 275 by eating about 2600 cal. per day. To keep my weight at 175, I'd have to eat less than 2000 cal per day. But that would be different according to your individual metabolism and exercise level.
All I do is take a daily walk and an occasional bike ride. Other people do much more strenuous exercise, so they can eat more. But one must be cautious, because as you get older, your calorie requirements drop by about 100 cal. every decade, merely as a function of aging. And as we get older and settle into more demanding work routines, we may find our weight inching up when we can no longer devote as much time to exercise. That's when adjusting calorie intake is a good idea. It's not realistic to assume that everyone can go to the gym and bust their ass on a regular basis.
Also, with obese people. Once they are obese, they do not have to gain weight in order to remain obese.
This is true, but calorie reduction can help the vast majority of people (thyroid problems excepted) to lose weight. A big problem is discouragement, since we tend to not notice as we gain weight, we just notice one day that all our pants are tight and we've gained 20 pounds, even though we feel like we didn't eat that much. It's very discouraging, and a lot of people give up right there, and the weight continues to pile on. When reducing, it takes quite a while, which can also be discouraging. Then we hit plateaus, even more discouraging. It's important to remember that if you stick to your regimen, it will pay off.
For example, I had been losing about 4 lbs per week for the first 2 months I was dieting. It was great. But then last week, I barely lost 2 lbs. Since my calorie intake is staying the same, but I am approaching a weight where my calorie needs will be closer to what I'm actually eating, it's only natural that there will be a plateau. Impatient people would need to increase their exercise if they want to push through those plateaus. Personally, I'm not in a huge rush. I've lost enough that my clothes are loose and all the weight-related maladies are gone, and that's the biggest thing. For the sake of my health, I want to get down near my ideal weight and stay there, but I don't want to wear myself down to do it.
I just thought that stat about the 12 calories was staggering. No wonder so many people let their weight get away from them - it takes so little in excess calories to start packing on pounds.
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