Enzymes have active sites where they come into contact with particular substrates. The catalytic properties of enzymes are a cyclic process. Once a substrate has come into contact with the active site of an enzyme, it is modified by the enzyme to form the end product.
1 Reducing saturated fat to no more than 5 to 6 percent of total calories. 2  For someone eating 2,000 calories a day thatâs about 11 to 13 grams of saturated fat. 3  Reducing the percent of calories from trans fat.
Fat is the most energy-dense macronutrient, which means it contains the most calories in each gram -- 1 g of fat provides 9 calories. If you consume 2,500 calories per day, your fat intake should range from 56 g to 97 g. Recommendations for fat are further specified by type of fat.