Hormones and activity play a major role in how much calories we burn. Just standing burns a lot more calories than sitting. Walking burns more yet. Generally as we get older we do far less activity even if that means just sitting more instead of standing. Couple that with hormonal influence on appetite and now you feel hungrier than normal so you eat more. Many people don’t even realize they’re beginning to eat more than they had. Finally when you are young, you’re not only burning calories for energy but also to grow and build your body. This takes an enormous amount of calories. You no longer need those additional calories beyond when your are done growing.
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