By Emma & Janani

B1B – DIET DILEMMAS

Teenagers need more protein to grow.

Older people need more calcium to protect the bones.

Athlete’s need more protein for their muscles to grow and need carbohydrates for energy

You can calculate the recommended daily allowance (RDA) protein using

this formula:

RDA (g) = 0.75 x body mass (kg)

The body mass index (BMI) is used as a guide to help decide whether someone is

underweight, normal, overweight or obese.

BMI = mass in kg ÷ (height in m)2

This table shows how BMI is used to

classify people’s weight.

BMI meaning

under 18.4 underweight

between 18.5 and 24.9

ideal weight

between 25 and 29.9 over the ideal weight

between 30 and 39.9 obese

over 40 very obese