I would like to start with the fact that it is far from always possible to put an “equals” sign between “eating everything” and an excess of incoming calories. You’re not with a friend 24/7, staring at her without blinking. Therefore, you cannot know how much and how she eats until you see. Add to this physical activity, if a friend plays sports. And if he is not engaged, there is also spontaneous activity, which you cannot follow either. What if she walks to the nearest supermarket more often than she does by car? Yes, it’s banal – she cleans her apartment more often, or her house is bigger and therefore she needs more energy for, for example, washing the floors. We do not yet take into account factors such as height, weight, age, amount of muscle tissue, etc., which distinguish the energy expenditure to support the life of a friend from your energy expenditure.
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