The clinical studies have confirmed that overweight persons treated with Xenical accompanied by some low calories diet intake in which not more than 30 % calories are obtained from fats in the diet, had maximum weight loss in comparisons only restricting their food calories.
In the clinical study during the first four weeks all the persons were on low calorie diet followed by low calories diet along with Xenical for 52 weeks to a group of these participants, whereas others continued with their only low calorie diet.
It was observed that the group only on low calorie diet lost only 5.8 lbs in the entire period, whereas persons on Xenical lost 13 lbs in three months and over a period one year their loss of weight was 19 lbs.
There are evidences to support that if one is over weight, a 5 to 10 %of weight loss it is followed by significant improvement in health. In studies of weight loss with Xenical along with their diet, that over a period of 2 years the more than 75 % of the persons experienced weight loss to the extent of 5 to 10 % of their body weight. Persons only on their low calories diet only 50 % of the people lost weight to the extent of 5 % body weight.