Mada za sehemu hiiDemonstrate an understanding of the dietary needs of various groups of peoplesMada 6
- Explain the concept of groups with special dietary needs (meaning, category and reasons)
- Analyse the nutritional requirements for each special group (children, adolescents, elders, vegetarians, pregnant women and lactating mothers, invalids and convalescents)
- Explain the concept of Nutrients values (meaning, types, uses and major factors considered in developing nutrient values)
- Use RDA/NRV's tables to determine nutritional requirements of individuals
- Compute the nutrients intake for different groups using food composition tables and compare with RDA
- Plan meals for each group of individual with special dietary needs based on RDA, food composition table and Tanzania food based dietary guidelines
Computing Nutrient Intake and Comparing with RDA
Food composition tables provide nutrient values for foods, which when combined with the amounts consumed, allow us to calculate total nutrient intake and compare it against Recommended Dietary Allowances (RDA) to assess whether dietary needs are being met.
RDA represents the average daily dietary intake level sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals in a specific age and gender group. RDAs serve as goals for individual daily nutrient intake and help prevent nutritional deficiencies.
Key Points About RDA
- RDAs are derived from Estimated Average Requirements (EARs)
- RDAs vary by age, sex, and physiological status (pregnancy, lactation)
- RDAs differ from Adequate Intakes (AIs), which are used when insufficient evidence exists for RDA
- Upper Tolerable Nutrient Intake Levels (ULs) indicate maximum intake without adverse health effects
A food composition table is a reference tool listing the amount of nutrients in 100g or 100mL of edible food portions. These tables include macronutrients (carbohydrates, proteins, fats) and micronutrients (vitamins, minerals).
Steps to Calculate Nutrient Intake
Step 1: Determine the weight of each food consumed in grams.
Step 2: Locate the nutrient values for each food from the composition table (values are per 100g).
Step 3: Calculate the nutrient content using the formula:
Step 4: Sum all nutrients from each food item to get total intake.
A person consumed the following foods in one day:
- 2 boiled eggs (each 50g)
- 2 slices of white bread (each 50g)
- 20g sugar in tea
- 400g maize stiff porridge
- 200g chicken relish with coconut milk
Food Composition Table Provided
| Food | Carbohydrate (g/100g) | Protein (g/100g) | Fat (g/100g) |
|---|---|---|---|
| Boiled Eggs | 1.1 | 12.6 | 10.6 |
| White bread | 51.9 | 8.8 | 3.0 |
| Sugar | 100 | 0 | 0 |
| Maize stiff porridge | 25.6 | 2.7 | 1.2 |
| Chicken relish with coconut milk | 2.3 | 6.1 | 11.8 |
Solution
Step 1: Total weight of each food consumed
- Eggs: 50g × 2 = 100g
- Bread: 50g × 2 = 100g
- Sugar: 20g
- Maize stiff porridge: 400g
- Chicken relish: 200g
Step 2: Calculate nutrients for each food
Eggs (100g):
- Carbohydrate: (100 × 1.1) ÷ 100 = 1.1g
- Protein: (100 × 12.6) ÷ 100 = 12.6g
- Fat: (100 × 10.6) ÷ 100 = 10.6g
White bread (100g):
- Carbohydrate: (100 × 51.9) ÷ 100 = 51.9g
- Protein: (100 × 8.8) ÷ 100 = 8.8g
- Fat: (100 × 3.0) ÷ 100 = 3.0g
Sugar (20g):
- Carbohydrate: (20 × 100) ÷ 100 = 20.0g
- Protein: (20 × 0) ÷ 100 = 0g
- Fat: (20 × 0) ÷ 100 = 0g
Maize stiff porridge (400g):
- Carbohydrate: (400 × 25.6) ÷ 100 = 102.4g
- Protein: (400 × 2.7) ÷ 100 = 10.8g
- Fat: (400 × 1.2) ÷ 100 = 4.8g
Chicken relish (200g):
- Carbohydrate: (200 × 2.3) ÷ 100 = 4.6g
- Protein: (200 × 6.1) ÷ 100 = 12.2g
- Fat: (200 × 11.8) ÷ 100 = 23.6g
Step 3: Total nutrients consumed
- Total Carbohydrate: 1.1 + 51.9 + 20 + 102.4 + 4.6 = 180.0g
- Total Protein: 12.6 + 8.8 + 0 + 10.8 + 12.2 = 44.4g
- Total Fat: 10.6 + 3.0 + 0 + 4.8 + 23.6 = 42.0g
Step 4: Calculate energy (kcal)
Remember: 1g carbohydrate = 4kcal, 1g protein = 4kcal, 1g fat = 9kcal
- Energy from carbohydrate: 180g × 4 = 720 kcal
- Energy from protein: 44.4g × 4 = 177.6 kcal
- Energy from fat: 42g × 9 = 378 kcal
Total daily energy intake = 720 + 177.6 + 378 = 1,275.6 kcal
After calculating nutrient intake, compare the results against RDA values from standard tables to assess adequacy.
RDA Reference Values (Selected)
| Life Stage | Protein (g/day) | Iron (mg/day) | Calcium (mg/day) |
|---|---|---|---|
| Adult Males (19-50y) | 56 | 8 | 1000 |
| Adult Females (19-50y) | 46 | 18 | 1000 |
| Pregnancy (14-18y) | 71 | 27 | 1300 |
| Lactation (14-18y) | 71 | 10 | 1200 |
Interpretation
- Intake meets RDA: Nutrient needs are adequately met for most individuals
- Intake below RDA: Risk of nutrient deficiency; dietary improvement needed
- Intake significantly above RDA: May indicate excess; consider balance
When calculating micronutrients, follow the same procedure as for macronutrients.
Example: Iron Intake Calculation
Using the food composition table below:
| Food Item | Iron (mg/100g) | Amount Consumed |
|---|---|---|
| Kande (maize and kidney beans) | 1.5 | 300g |
| Dried fried fish | 1.7 | 20g |
| Cooked spinach | 3.6 | 100g |
| Watermelon | 0.2 | 150g |
Calculation:
- Kande: (300 × 1.5) ÷ 100 = 4.5mg
- Dried fried fish: (20 × 1.7) ÷ 100 = 0.34mg
- Cooked spinach: (100 × 3.6) ÷ 100 = 3.6mg
- Watermelon: (150 × 0.2) ÷ 100 = 0.3mg
Total Iron = 4.5 + 0.34 + 3.6 + 0.3 = 8.74mg
If RDA for iron is 8mg for adult males, this intake meets the requirement.
When computing nutrient intake for different population groups, consider:
- Age groups: Children, adolescents, adults, and elderly have different RDAs
- Sex: Males and females have different iron and energy requirements
- Physiological status: Pregnant and lactating women require increased nutrients
- Activity level: Physically active individuals need more energy
In Tanzania, a student or community health worker can use food composition tables and RDA values to plan meals for a family or in school feeding programs. For example, when budgeting for a student's lunch at a local market in Dar es Salaam, calculating the protein and iron content from a serving of beans (150g) and rice (200g) using the Tanzania Food Composition Table helps ensure the meal meets the student's RDA for iron (8mg/day) and protein (56g/day), enabling better nutritional planning with limited money.
Swali
What does the term RDA stand for in nutrition?
Ingia ili kuwasilisha jibu lako na lihesabiwe katika umahiri wako.
Ingia ili kufanya mazoeziMwalimu
Umekwama? Niulize chochote kuhusu mada hii.
Ingia ili kumuuliza Mwalimu wa AI wa Sonza kuhusu swali hili.
Ingia ili kuuliza