Meal Planning and Balanced Diet: Dietary Guidelines and Food Exchange Lists
What a balanced diet must satisfy
A balanced diet supplies energy and all nutrients in the amounts required for a person's age, sex, activity and physiological state, with enough variety for palatability and fibre. The working checklist is adequacy, balance, calorie control, moderation and variety. ICMR's Dietary Guidelines for Indians and the 'My Plate for the Day' model translate these into food-group proportions.
Food exchange lists
An exchange list groups foods so that one portion of any item in a list supplies roughly the same energy and macronutrients as any other. This allows variety without recalculating the whole diet: a cereal exchange can be swapped for another cereal, never for a vegetable.
Factors that shape a plan
Age, sex, activity level, physiological state, income, season and local availability, culture, religion, cooking facilities, food habits, and for patients, the therapeutic modification required.
Worked example
Plan around 1800 kcal for a vegetarian adult using approximate exchange values: cereal 80 kcal, pulse 100 kcal, milk (100 ml) 100 kcal, vegetable 25 kcal, fruit 40 kcal, fat 45 kcal each. 9 cereal (720) + 3 pulse (300) + 3 milk (300) + 4 vegetable (100) + 2 fruit (80) + 4 fat (180) = 1680 kcal, with about 60–100 kcal left for sugar and condiments. Reasoning: the total is deliberately close rather than exact; exchanges buy variety at a fixed nutrient cost, and cereal–pulse combinations improve protein quality.
Traps that cost marks
Exchanges are defined by macronutrient and energy content, so rice and chapati are interchangeable but rice and a vegetable are not. The RDA applies to population groups, not to a named individual. A balanced diet for a pregnant woman, a child and an elderly person is not the same plan. Vegetarian plans need attention to complementary protein, B12, iron and calcium.