# Percentages and Food Content

Gather three of your favorite packaged foods, perhaps one from each: breakfast, lunch and dinner. Use the model used by the food industry, example and analyze, through the mathematical formula explained, the fat content and protein content from your foods.

The written paper should be one page in length and concise in your reasoning. Plan your paper by organizing the data, formulas and then computations. You may attach the calculations as a scanned in hand written document, but make sure it is readable.

(Model used by food industry)

Suppose a 10-ounce serving of a food containing 240 calories, and the label states that it contains 9 grams of fat. The food industry then converts 10 ounces to grams by multiplying each ounce by 29 grams; hence, the total weight of the product is 290 grams, and if there are 9 grams of fat, the percentage of fat is

9

_____ x 100%= 3.1%

290

The procedure by the food industry is misleading. The correct way to calculate the fat content is to multiply the number of grams of fat by 9 to get the calories. (Each gram of fat is converted to 9 calories.) In this case, 9 x 9 =81 calories. Next, divide the fat calories by the total calories and multiply by 100% to get the percentage of calories derived from fat. In this case, the label stated that a 10 ounce serving contained a total of 240 calories.

81

____ x 100%= 33.75%

240

Hence, 33.75% calories come from fat, not 3% as suggested.

(My three foods)

1) Pillsbury Toaster Strudel, Strawberry

Serving size- 1 pastry (54g)

Calories for single serving-190

Fat content- 8 grams

Protein- 3 grams

2) Raisin Bran Crunch

Serving size- 1 Cup (53g)

Calories for a single serving-190

Fat Content- 1 gram

Protein- 3 grams

3) Activia Yogurt, Vanilla

Serving Size- 1 Container (4 oz)

Calories for a single serving-110

Fat Content-2 grams

Protein-5 grams