Rda
Could you clarify what you mean by "Rda"? Here are a few possibilities:
- RDA - Recommended Dietary Allowance (nutrition)
- RDA - a data format used in R programming (.rda files)
- RDA - Redundancy Analysis (statistics)
- Something else entirely?
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RDA from park
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Recommended diatery allowance in psm
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I now have comprehensive information from Park's PSM. Let me compile the full answer.
Recommended Dietary Allowance (RDA) - Park's Textbook of PSM
Definition
RDA = The average daily dietary nutrient intake level sufficient to meet the nutrient requirement of nearly all (97-98%) healthy individuals in a particular life stage and gender group.
- Park's Textbook of Preventive & Social Medicine
Key Terminology (Dietary Reference Intakes)
| Term | Definition |
|---|---|
| RDA | Intake meeting needs of 97-98% healthy individuals = Mean + 2 SD |
| EAR (Estimated Average Requirement) | Meets needs of 50% of individuals in a life stage/sex group |
| Adequate Intake (AI) | Used when RDA cannot be determined; based on observed intakes of healthy groups (called "Acceptable Intake" in Indian context) |
| TUL (Tolerable Upper Intake Level) | Highest daily intake unlikely to cause adverse effects in almost all individuals |
Important: For energy, RDA = mean requirement (NOT mean + 2 SD), because both excess and deficient energy intake are harmful. For all other nutrients, RDA = mean + 2 SD.
How RDA is Derived
Two factors:
- Individual variability - RDA covers 97.5% of individuals (mean + 2 SD). Only 2.5% will have requirements above RDA.
- Nutrient bioavailability from the habitual diet (e.g., protein RDA accounts for NPU/Net Protein Utilization)
ICMR 2020 Energy Requirements (Table 23, Park's PSM)
| Category | Work Type | Energy (kcal/day) |
|---|---|---|
| Adult Men | Sedentary | 2110 |
| Adult Men | Moderate | 2710 |
| Adult Men | Heavy | 3490 |
| Adult Women | Sedentary | 1660 |
| Adult Women | Moderate | 2130 |
| Adult Women | Heavy | 2720 |
| Pregnant women | - | +350 kcal/day (2nd trimester), +350 kcal (3rd trimester) |
| Lactating (0-6 months) | - | +600 kcal/day |
| Lactating (7-12 months) | - | +520 kcal/day |
ICMR 2020 Protein Requirements
- Adult male and female: 0.88 g/kg body weight/day (assuming NPU of 65)
- Pregnancy additions: +1 g/day (1st trimester), +9.5 g/day (2nd trimester), +22 g/day (3rd trimester)
- Lactation (0-6 months): +13 g/day above normal
- Protein Energy % (PE%): Recommended at 10-12% of total daily energy
Summary RDA for Indians 2020 (Table 28, Park's PSM) - Key Values
| Group | Protein (g/d) | Calcium (mg/d) | Iron (mg/d) | Vit C (mg/d) | Vit A (µg/d) |
|---|---|---|---|---|---|
| Adult Man (sedentary, 65 kg) | ~54 | 1000 | 17 | 80 | 900 |
| Adult Woman (sedentary, 55 kg) | ~46 | 1000 | 29 | 80 | 840 |
| Pregnant woman | +22 g (3rd trim) | 1200 | 35 | 80 | 1000 |
| Lactating (0-6 m) | +13 g | 1200 | 21 | 95 | 1300 |
| Infants (0-6 m) | 1.69 g/kg | 300 | - | 40 | 400 |
Key Points for Exams
- RDA is not a standard to assess whether an individual's requirement is met - it is set above most individuals' requirements.
- Energy is the exception - RDA for energy = mean (not mean + 2 SD).
- RDA values in India are set by the ICMR Expert Group (latest revision: 2020).
- The concept of RDA was popularized by the US National Research Council (first published 1941).
- Physical Activity Level (PAL) = Total Energy Expenditure / BMR - used in modern energy requirement calculations.
- Protein quality is assessed by Net Protein Utilization (NPU) and Protein Efficiency Ratio (PER).
All data from: Park's Textbook of Preventive and Social Medicine (ICMR 2020 recommendations)
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