01. You're not getting enough sleep.

02. Not eating enough fiber.

03. Not hydrated. Drink 3 liters per day.

04. Adding too much oils to your meal.

05. Not eating enough protein.

06. Doing too much cardio and not enough resistance training.

07. Eating a lot of high calorie healthy foods.

08. Roughly estimating your calories.

09. Eating too much processed carbs and sugar.