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.
How Many Grams of Fat Per Day. The number of grams of fat you can eat depends on the total number of calories allotted for your diet plan each day. Fat has 9 calories per gram. So someone who eats 2,000 calories per day is shooting for 20 to 35 percent of those calories from fat -- which is between 44 and 78 grams of fat per day.