What does it mean to eat low fat? There really isn't one definitive answer but within the range of 20-30 percent of daily calories can be considered low fat. Unless directed by a physician, no one should aim for lower than 20 percent: unlike sugar, fat is essential to our diet. Want to know more? Here's the lowdown on what eating low fat really means. The good news is that it shouldn't leave you feeling hungry or consigned to a diet of raw vegetables!