Pure Dietary Keto : Weight Loss Huh? Isn't losing weight the whole point? Yes it is! But as you lose weight the number of calories your body requires to maintain itself also reduces. As mentioned earlier, even fat needs calories to keep up itself. Solution: As you lose weight, check your BMR frequently to determine how several calories your body needs per day and maintain a calorie consumption around five hundred calories but that. But bear in mind, don't consume less than 1200 calories.