Body mass index and individual metabolic rates impact how quickly different individuals produce ketones. This means that on the keto diet, some people lose weight more slowly than others — even if they are following the same exact keto diet plan.
And, even fruits and vegetables are limited because they, too, contain carbs. For most people, the keto diet requires making big shifts in how they usually eat. When you eat less than 50 grams of carbs a day, your body eventually runs out of fuel it can use quickly.