A study performed in obese mice showed that vitamin D supplementation limited weight gain from a high-fat diet by increasing fatty acid oxidation.
Fatty acid oxidation, also known as beta-oxidation, is the process by which fatty acid molecules are broken down in the mitochondria to be used to generate energy.
There has been a lot of interest in the relationship between obesity and vitamin D deficiency. Researchers are interested in whether vitamin D deficiency causes obesity, or if obesity causes vitamin D deficiency. Much of the recent evidence suggests it is the latter, in that increased body weight leads to an increased need for vitamin D meaning that overweight individuals can be at increased risk for vitamin D deficiency.