soccer, its vigorous!
A growing boy needs to eat and not worry about calories!
Fats
people with a higher basal metabolic rate
Generally group 1 elements.
The most common group is people with hemachromatosis.
More likely, it is growing teen males who need the most calories.
It depends. Usually a bagel is around 250 calories.
People who are active typically need more calories than those who are not active. This is because physical activity increases energy expenditure, which requires more calories to fuel the body's needs. In contrast, people who are less active have lower energy demands and therefore require fewer calories.
It varies from egg to egg, but generally jumbo egg whites have a calorie count between 15-20 (the most common estimate I saw was 18 calories).
Energy are just calories. So it depends on the energy bar and drink, but generally, most energy bars contain more calories than most energy drinks.
Most food/beverages will have nutrition information on the packaging, if not, i find doing a search in Google will generally come up with the right answer!