6.1 Food Exchange Lists, Meal Plan Computation, Food Labels, and Nutrient Density
Key Takeaways
In the Philippine food exchange lists, one rice exchange (rice B) provides 23 g carbohydrate, 2 g protein, and 100 kcal, such as one-half cup of cooked rice.
One low-fat meat exchange provides 8 g protein, 1 g fat, and 41 kcal, while a medium-fat meat exchange provides 8 g protein, 6 g fat, and 86 kcal.
A meal plan is computed by fixing vegetable, fruit, milk, and sugar exchanges first, then filling the carbohydrate balance with rice, the protein balance with meat, and the fat balance with fat exchanges.
Under FDA Circular No. 2023-009, labels express nutrients as a percentage of the PDRI 2015 recommended energy and nutrient intakes (%REI/RNI), based on the values for men aged 19-29 unless the product targets another group.
The index of nutritional quality divides the percentage of a nutrient requirement a food provides by the percentage of the energy requirement it provides; a value of 1 or more marks a good source.
The basic nutrition area asks examinees to apply exchange lists and food labels to translate nutrient needs into food choices, and to distinguish nutrient density from energy density. Exchange computation also appears in diabetes, renal, and weight management questions.
The Exchange System
An exchange is a portion of food that provides about the same amount of carbohydrate, protein, fat, and energy as other foods on the same list. Foods within a list can be swapped freely, so one meal plan allows many menus. The Philippine lists (FNRI) are commonly used with these values per exchange:
| List | Carbohydrate (g) | Protein (g) | Fat (g) | Energy (kcal) | Sample portion |
|---|---|---|---|---|---|
| Vegetable | 3 | 1 | 0 | 16 | 1/2 cup cooked or 1 cup raw |
| Fruit | 10 | 0 | 0 | 40 | 1 small banana (latundan) or 1 slice papaya |
| Milk, whole | 12 | 8 | 10 | 170 | 1 cup fresh milk |
| Milk, low-fat | 12 | 8 | 5 | 125 | 1 cup low-fat milk |
| Milk, skim | 12 | 8 | trace | 80 | 1 cup skim milk |
| Rice A (low protein) | 23 | 0 | 0 | 92 | Sago, gulaman, cornstarch |
| Rice B (medium protein) | 23 | 2 | 0 | 100 | 1/2 cup cooked rice, 1 slice loaf bread |
| Rice C (high protein) | 23 | 4 | 0 | 108 | Selected high-protein cereal products |
| Meat, low-fat | 0 | 8 | 1 | 41 | 1 matchbox-size lean meat or fish |
| Meat, medium-fat | 0 | 8 | 6 | 86 | 1 whole egg, chicken with skin |
| Meat, high-fat | 0 | 8 | 10 | 122 | Pork belly, processed sausage, cheese |
| Fat | 0 | 0 | 5 | 45 | 1 tsp oil, butter, or margarine |
| Sugar | 5 | 0 | 0 | 20 | 1 tsp sugar |
Some versions split vegetables into list A (very low in carbohydrate; eaten freely) and list B (3 g carbohydrate, 1 g protein, 16 kcal). Use the version the question names.
Computing a Meal Plan from a Diet Prescription
Example: Diet prescription of 1,800 kcal with 60% carbohydrate, 15% protein, and 25% fat.
Step 1. Convert percentages to grams.
| Macronutrient | Energy | Grams |
|---|---|---|
| Carbohydrate | 1,800 x 0.60 = 1,080 kcal | 1,080 / 4 = 270 g |
| Protein | 1,800 x 0.15 = 270 kcal | 270 / 4 = 67.5, about 68 g |
| Fat | 1,800 x 0.25 = 450 kcal | 450 / 9 = 50 g |
Step 2. Fix the "free choice" lists first according to the patient's needs and preferences: 3 vegetable, 4 fruit, 1 low-fat milk, and 4 sugar exchanges.
| List | Exchanges | Carbohydrate | Protein | Fat |
|---|---|---|---|---|
| Vegetable | 3 | 9 | 3 | 0 |
| Fruit | 4 | 40 | 0 | 0 |
| Milk, low-fat | 1 | 12 | 8 | 5 |
| Sugar | 4 | 20 | 0 | 0 |
| Subtotal | 81 | 11 | 5 |
Step 3. Rice for the carbohydrate balance: (270 - 81) / 23 = 8.2, so 8 rice exchanges (184 g carbohydrate, 16 g protein).
Step 4. Meat for the protein balance: protein so far is 11 + 16 = 27 g; (68 - 27) / 8 = 5.1, so 5 meat exchanges, for example 3 low-fat and 2 medium-fat (40 g protein, 3 + 12 = 15 g fat).
Step 5. Fat for the fat balance: fat so far is 5 + 15 = 20 g; (50 - 20) / 5 = 6 fat exchanges.
Step 6. Check the totals: carbohydrate 265 g, protein 67 g, fat 50 g, about 1,780 kcal, within 5% of the prescription. Then distribute the exchanges across breakfast, lunch, dinner, and snacks.
Tip
Always fill rice after the fixed lists (because rice supplies most carbohydrate), meat after rice (because rice also adds protein), and fat last (because milk and meat already contain fat). Doing the steps out of order is the most common computing error.
Using Exchanges in Therapeutic Diets
- Diabetes: keeps carbohydrate consistent at each meal; 1 carbohydrate choice in carbohydrate counting is about 15 g.
- Kidney disease: rice A (low protein) and fat exchanges add energy without protein; meat exchanges are chosen for high biological value protein.
- Weight loss: low-fat meat and skim milk lists lower energy while keeping protein.
Reading Food Labels in the Philippines
Prepackaged foods carry the product name, ingredient list in descending order of weight, net content, manufacturer or distributor details, lot or batch identification, date marking, storage instructions, allergen information, and a Nutrition Facts panel.
FDA Circular No. 2023-009 adopted the PDRI 2015 recommended energy and nutrient intakes for labeling:
- Nutrients are declared as %REI/RNI instead of the old %RENI, and labels carry the statement "Based on PDRI 2015."
- For products for the general population, the percentages use the values for men aged 19-29; products for children use the values for children aged 6-9 unless another age group is specified.
- Iron percentages use the men's value unless the product is intended for women.
- Fiber percentages use 25 g, the upper end of the adult range of 20-25 g.
- Sodium has no RNI, so labels use the WHO sodium limit.
How to use a label in counseling:
- Check the serving size and the number of servings per pack.
- Compare energy, sodium, sugar, saturated fat, and fiber per serving.
- Use %REI/RNI to judge whether a serving is a high or low source of a nutrient.
- Read the ingredient list for allergens, hidden sugars (sucrose, syrups), and sodium sources (salt, MSG, sodium phosphates).
Nutrient Density and Energy Density
- Energy density is the energy per gram of food (kcal/g). Fat (9 kcal/g) raises energy density, while water and fiber lower it. Vegetables, fruits, and soups have low energy density; fried foods and sweets have high energy density.
- Nutrient density is the amount of nutrients per unit of energy. Malunggay, small fish, and fruits are nutrient-dense; soft drinks and candies provide "empty calories."
The index of nutritional quality (INQ) compares the two:
Example: a snack provides 200 kcal (10% of a 2,000 kcal requirement) and 30 mg vitamin C (about 43% of a 70 mg RNI). INQ = 43 / 10 = 4.3, so the snack is an excellent source of vitamin C for its energy. An INQ of 1 or more means the food supplies the nutrient in proportion to or above its energy contribution.
A diet provides 270 g carbohydrate. The fixed lists (vegetables, fruit, milk, and sugar) already supply 81 g carbohydrate. Using the Philippine exchange value for rice, how many rice exchanges complete the carbohydrate?
About 4 exchanges
About 6 exchanges
About 8 exchanges
About 12 exchanges
When computing exchanges for a meal plan, why is the number of fat exchanges calculated last?
Milk and meat exchanges already supply fat, so the remaining fat is known only after they are set
Fat exchanges contain carbohydrate, which must be subtracted from the total carbohydrate allowance first
Fat is the macronutrient with the lowest energy per gram
Fat exchanges are optional and can be omitted
A label shows that one serving of a snack provides 150 kcal (7.5% of the energy reference) and 20% of the RNI for calcium. What is its index of nutritional quality for calcium, and how is it interpreted?
0.4, a poor source of calcium
1.0, an average source
12.5, a poor source of calcium because its energy content is high
About 2.7, a good source of calcium for its energy content
Sections you finish are checked off in the contents.