The central nervous system in the average man weighs about 1480 grams, or just over 3 pounds.

For people who eat 2,000 calories a day, that's about 22 grams.

Its brain showed another small increase in size, and may have weighed about 550 grams.

This is about 2.2 grams for a body mass of 100 kg.

The usual dose is about 3.5 grams twice a day.

This is about 25 to 30 grams in a 2,000-calorie diet.

After a year they average about 25 grams in weight.

In fact, most people consume too little about 5 grams a day.

A 9-year-old should eat about 14 grams of fiber daily.

These devices have no moving parts, and weigh about 50 grams.