Add soluble fiber, ideal ally About a sample of 1100 adults, a study published in the journal Obes Slimfire Forskolin y Journal explained that every 10 grams of soluble fiber that subjects added to their diet their abdominal fat was reduced by 3.7% over 5 years due to the effect saciante of this type of fiber that dissolves in the water. Some foods contain a greater amount: oat bran, oats, barley, peas,