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 Recommendations. All fats, good or bad, have 9 calories per gram. Between 20 percent and 35 percent of your total caloric intake should come from fat, according to the Dietary Guidelines for Americans 2010. If you consume an average of 2,000 calories per day, you can include 44 to 77 grams of fat.