The theory behind zero calorie or negative calorie foods is that they contain such a scant amount of calories that the energy you expend eating them cancels out their calories. In essence the bottom line is that you don’t take on any excess calories.
Upping my protein has been the hardest! 12 High Protein Lunches - Protein is important for keeping you full and focused, so having enough at lunch is essential. You don’t want to be hungry again before the end of your workday!