One 2009 report published in the Journal of Nutritional Biochemistry found that CLA has positive effects on energy metabolism, adipogenesis, inflammation, lipid metabolism and apoptosis. (6) A 2007 study published in the British Journal of Nutrition similarly found that supplementation of a CLA mixture in overweight and obese people (three to four grams a day for 24 weeks) decreased body fat mass and increased lean body mass. (7) And regarding CLA’s safety, there seems to be very little risk for adverse effects on overall blood lipids, inflammation levels and insulin response in healthy, overweight or obese adults.
Caffeine is often included in fat-burning supplements the form of yerba mate or guarana — however, manufacturers may include these substances in amounts they’re rarely used otherwise. Caffeine is a common weight loss ingredient because it often has the effect of dulling someone’s appetite and help increase energy for activity. However, too much caffeine can cause side effects like jitteriness, headaches, insomnia, anxiety, heart palpitations, diarrhea and more.
Want to lose that belly fat fast? In your dreams! Seriously, though: a good night's sleep is one of the best ways to get rid of that extra fat around your waist for good. Among the 60,000 women participating in the Nurses' Health Study, those who snoozed for fewer than five hours a night were at the greatest risk of becoming obese and gaining 30 or more pounds over the course of the 16-year study period when compared to those who slept for seven or more hours.
The fat-burning equation is simple: Protein builds muscle. More muscle = more fat burning. And fish is one of the healthiest sources of lean protein—especially wild salmon, says dietitian Lauren Minchen, MPH, RD, CDN. It's also a rich source of anti-inflammatory omega-3 fatty acids, which fuel fat burning, block fat storage and aid weight loss, she explains. But that's not all: "Getting enough protein and healthy fat also helps to reduce cravings and has been shown to help keep weight off for longer," adds Alissa Rumsey, MS, RD, CDN, CSCS.
Surprised? Although olive oil contains fat, it actually contains a type of healthy fat that has been found to decrease levels of fat-storing inflammation. According to a review published in the International Journal of Molecular Sciences, a polyphenol only found in unrefined extra virgin olive oil—oleocanthal—reduces inflammation in a similar way that ibuprofen does: it prevents the production of two pro-inflammatory enzymes, COX-1 and COX-2.
These supplements also make it harder for your body to absorb more fat from the foods you eat. In addition, they can also make it easier for you to stick to your diet and keep your caloric intake low to prevent additional weight gain. All in all, they are designed to help you lose weight and decrease the amount of body fat you have by increasing your metabolism.