Of course you can get all that fat from healthy unsaturated fats such as avocados, tofu, almonds, walnuts, seeds and olive oil. Your liver is only forced into producing ketones when carb intake is drastically slashed. In the keto diet, you limit your intake of carbs to only 20 to 50 a day, the lower the better. To put that into perspective, a medium banana or apple is around 27 carbs, the full day's allowance. Eating too many carbs causes your blood sugar to spike.