Weigh and measure everything you put in your mouth. Then track it. Either on paper or in an app. Do not guesstimate calories or serving sizes. If you are eating processed food, read the label. Some supposedly healthy protein bars have upward of 300 calories.
Make your own meals, using fresh ingredients. Restaurant food tastes so good due to added fats, butters and salts. Avoid overly processed foods, excessive carbs and added sugars.
Eat 60-80 grams of protein,depending on what your program requires.Once you reach that amount, stop eating. Drink 64 oz of water.