The Genie Age
Why 9 to 19
Ten years build most of the grown-up body. Then the door shuts.
These ten years are the last big growth spurt a body gets. A child adds most of their adult height. They build most of their bones. And the brain rewires the parts that handle focus, sleep and stress.
It runs on its own clock. It looks different in every child. And it happens once. Nothing after 19 opens it again.
Four things these ten years decide.
1
Height
Long bones grow at plates near each end. At the end of puberty those plates close, and the growing stops. Nothing opens them again. That is why the years before matter so much.
2
Bone
Bones store most of their strength in these years. What is not stored now is not stored later. The body then lives off it for the next seventy years.
3
The brain
The brain keeps wiring itself all through the teens. Mostly the parts that handle focus, planning and stress. This window sets how much they can carry later.
4
Iron and periods
Once periods start, the body needs much more iron, and it keeps needing it. A tired teen girl is often low on iron, not lazy. It is a cheap thing to check.
A 13 year old is not a small grown-up.
Pound for pound, a growing teen needs more than a grown-up does. And they need different things. More calcium, because the bones are still going up. More iron, because there is more blood to make, and because periods have started. More protein, because muscle is being built fast.
Most teen pills are just grown-up pills in a smaller dose. That is backwards. A smaller body doing more work does not need less. It needs different.
What the body is really asking for.
Just protein, per day, for an Indian teen. It almost doubles between 10 and 18.
| Age | Boys | Girls |
|---|---|---|
| 10 to 12 | 31.8 g | 32.8 g |
| 13 to 15 | 44.9 g | 43.2 g |
| 16 to 18 | 55.4 g | 46.2 g |
ICMR-NIN, Nutrient Requirements for Indians, 2020.
What to feed it, from an Indian kitchen.
Food first, always. Most of this is already in the house.
Calcium
Ragi, til, curd, paneer, milk, rajgira, drumstick leaves.
Iron
Gud with chana, palak, bajra, rajma, dates, poha, and liver if the house eats it.
Protein
Dal, egg, curd, paneer, soya, peanuts, sprouts.
Vitamin D
Twenty minutes of morning sun on arms and legs. Milk with added vitamin D when there is no sun.