The United States Department of Agriculture suggests that approximately 50 percent of your calories come from carbohydrates, about 30 percent from fats, and approximately 20 percent from protein sources. One gram
of protein has about four calories, one gram
of fat has about nine calories, and one gram
of carbohydrate has about four calories.
You need 310.8 grams of carbohydrates, 82.1 grams of fat, and 124.3 grams of protein per day for 2486.7 calories to maintain your weight of 168 pounds.