For athletes seeking to improve performance or to meet required weight classification for participation in a sport, it is not uncommon to seek additional weight loss even if they are already at their ideal body weight. Weight loss in individuals who are overweight or obese can reduce health risks,  increase fitness,  and may delay the onset of diabetes. Weight loss occurs when the body is expending more energy in work and metabolism than it is absorbing from food or other nutrients. The Cochrane Database of Systematic Reviews. Unintentional weight loss can occur because of an inadequately nutritious diet relative to a person's energy needs generally called malnutrition.
Does Garcinia Cambogia Actually Work. Woman Smiling and Holding a Supplement I managed to find several research studies on Garcinia Cambogia, in both animals and humans. According to some studies in rats, it can inhibit a fat producing enzyme called Citrate Lyase, making it more difficult for the body to produce fat out of carbohydrates (1).
Other rat studies show increased levels of the neurotransmitter serotonin. This could theoretically lead to reduced appetite and cravings (2).