With the low-carb diet, you are relying upon to get your daily calories mainly from fat and protein, and very little from carbohydrates. If your carb intake is less than 30 grams a day, your body will finally reach the metabolic state called ‘ketosis’. Instead of breaking down carbohydrates to generate glucose for energy, your body will break down stored fat which releases ketones in your body. They are also released in your breath, producing a distinct scent that some keto enthusiasts identify as rotten fruit, or even metallic.