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.
Total Fat Intake. The Institute of Medicine recommends adults consume between 20 and 35 percent of their total calories from fat. A gram of fat contains 9 calories, so the guidelines equate to between 44 and 78 grams of fat per day for a 2,000-calorie diet.