11. Green Coffee Bean Extract Green coffee bean extract is commonly found in many weight loss supplements. It is made from coffee beans that have not been roasted and is rich in chlorogenic acid, which is believed to explain its potential weight reduction effects. One study found that drinking green coffee reduced body mass index (BMI) and abdominal fat in 20 participants, even with no change in calorie intake . Another review of three studies concluded that green coffee bean extract can reduce body weight by an average of 2.5 kg. However, the researchers noted that the quality and size of available studies were somewhat limited . Therefore, more high quality studies are needed to assess the effectiveness of green coffee bean on weight loss . 12. Cumin cumin is a spice made from the dried and ground seeds of Cuminum cyminum , a flowering plant in the parsley family. It is well known for its distinct nutty flavor, but also rich in health benefits, including the potential to speed up weight loss and fat burning . A small three-month study found that women who ate cottage cheese with 3 grams of cumin twice a day lost more weight and body fat than a control group . Similarly, an eight-week study reported that adults who took a cumin supplement three times a day lost 1 kg more than those who took a placebo.