Avoid deep fried foods, processed foods, refined foods and foods high in saturated fats. Eat foods that are nutrient-dense, high in fiber and
low in
fat, eat lean meats,
low fat dairy, whole grains, fruits, vegetables, seeds, nuts and legumes.
No liquid calories. If you want to get a six pack in a month, then no useless calories in the form of alcohol and at your age I'm sure you aren't drinking alcohol! sugared beverages like soda, sweetened teas and coffee drinks.