1g of fat corresponds to 9 kcal. 3500/9 = about 400 grams of fat (not under the hands of the calculator). If there is an excess every day, then in a month you can gain 12kg ....
I read that in order to gain 1 kg, it takes about 7,500 kcal.
It turns out that the extra 3500 kcal will give you about 0.466 kg of fat :)
No need to compose anything superfluous. One gram of fat is equivalent to 9-10 calories consumed in excess of spending, that is, 3500 calories on top per day is 350 grams of fat per belly or f & ₽. And no need to talk about increased metabolism or stories "my uncle eats full plates four times a day and gets fat", your uncle just doesn't eat beer with chips and drinks vodka without snacking.
Depends on many factors - your level of activity, strength training, type of nutrition, and so on. if you are a training athlete on steroids, and the excess in calories was due to protein, then most likely most of it will go to muscle growth. If you are a sluggard who ate extra calories on cakes / pizzas / chips / soda, etc., then you will have excess fat. They say that the body cannot store more than 100 grams of fat per day, because this also requires resources. Whether this is so or not is a moot point. But in any case, you will have edema and weight gain in the form of water (carbohydrates retain water) and calla lilies (unprocessed food in the digestive tract)