Some vegetables can also be fairly high in carbs and fruits can also contain high amounts of sugar – looking at you, apples – so please always check the label before you decide on what to include in your diet. "Anything that’s low in carbs! Especially avoiding sugar. Generally, the aim is to go under 30 grams of carbohydrate per day." You may be able to minimize the effects of keto flu by drinking plenty of water and getting plenty of sleep.