This is because the diet is so high in fat that it puts added pressure on both organs, which are essential for fat metabolism . It doesn’t matter to your body whether the fat it’s burning is from your existing reserves or from the high fat meal that you just ate. And the production of ketones doesn’t necessarily mean you are burning body fat. So when keto dieters add fat to their diet through bulletproof coffee or coconut oil, it is burnt as fuel instead of body fat – which defeats the object of the diet achieving weight loss. She should not start following a keto diet plan suddenly.