Some individuals credit Bragg vinegar's activation of enzymes that block incoming body fat for helping with weight loss. Others credit acid or pectin in the vinegar. However, the use of Bragg vinegar or apple cider vinegar in weight loss is controversial, with some medical studies finding little to no benefit.
There are different theories as to why Bragg or apple cider vinegar contributes to weight loss. Bragg reports that in 2009, an article in First For Women found that the acetic acid in vinegar activates genes that manufacture fatty acid oxidation enzymes, which in turn help to break down existing body fat and block the storage of incoming body fat. The article recommended consuming two tablespoons of the vinegar per day.
According to Nava Atlas, an author of vegetarian cooking, the pectin in apple cider vinegar contributes to weight loss by increasing feelings of fullness. Furthermore, the acid in the apple cider vinegar helps to digest proteins that are building blocks of growth hormone, which helps stimulate the metabolism. The acids also help to release iron from foods, which helps to build hemoglobin and myoglobin that carry and attract oxygen. Oxygen helps to burn energy in the body.
The subject of using vinegar for weight loss is controversial, due to the lack of solid medical evidence.