How much caffeine per day is recommended?

None. Your body gets enough energy from the food you eat, if you eat the right foods.

According to Health Canada's website, the daily maximum safe intake of caffeine varies widely. However, they recommend the following guidelines: General Population, healthy adults: <400 mg per day Women of child-bearing age: <300 mg per day Children: no more than 2.5 mg per kilogram of weight, on average: 10-12 years of age: <85 mg 7-9 years of age: <62.5 4-6 years of age: <45 mg.