If you feel tired by half the day, the first thing you got to do is to check your food list! You may be feeding your system with the wrong foods that may be making you wear out faster. For example, if you take coffee in the morning, its energy burst will last two hours at the maximum. After this, it will leave you with a slump. If you eat high gylcemic foods like white bread in the morning, it breaks down very fast. That means you will feel hungry again quickly. Red meat also takes up a lot of energy to get digested, leaving you low on stamina.
Eat a nutritious breakfast rich in fibre to give you long lasting energy!
Know more foods that tire you quickly here.