If you need 2000 calories per day and you regularly consume 2500 you'll

Begin to store calories in the form of fat. This increase body mass and you become over weight. If you continue to gain more calories each day you can become obese. This condition leads to health problems such as high blood pressure and diabetes.

this exceeds energy expendoture.this exceess energy is converted into body fat AKN.consequently there is everweight or obes.obesity can be caused by overeating, in terus carbohidrat ,fat ,and protein,but also due to less moving.obesity can cause disturbances in the body function,is a risk to suffer from chronic illnesses,such as diabetes mellitus,hppertension, corony heart diseasea cancer,and can shorten life expectancy

Maximal strength i believe

He will get sick right away , he will have low energy , he will loose all his nutrition