Milk can lead to anemia

In the event that a child under school age drink more than two glasses of milk a day, his body decreases the amount of iron, which can lead to anemia.

According to the study, which was attended by 1,300 children of preschool age, children should not drink more than two glasses of milk a day. Milk contains calcium and vitamin D, needed for bone growth. However, excessive intake of milk in the body is accompanied by a decrease in the amount of iron, and iron deficiency leads to movement disorders.

Children who drank three or more glasses of milk per day had reduced levels of serum ferritin, which reflects the state of body iron stores. The more milk the children drank, the lower ferritin levels fell.

The American Academy of Pediatrics recommends limiting consumption of cow's milk for preschoolers to two glasses a day. However, the Committee on Nutrition believe that children who drink at least four glasses of milk a day, should be given supplements of vitamin D. Supplementation with vitamin D is required blacks children and children who spend little time in the sun, because vitamin D is produced in the skin by sunlight.

Lose Weight Sleep 9 Hours a Night

Sleeping too much does not make one fat in fact, sleeping more than 9 hours a night may suppress genetic influences on body weight, U.S. researchers say.

Principal investigator Dr. Nathaniel Watson of the University of Washington and colleagues said the study looked at 1,088 pairs of twins and found sleeping less than 7 hours a night was associated with both increased body mass index and greater genetic influences on BMI.

The study, published in the journal Sleep, found the heritability of BMI was twice as high for short sleepers than for twins who slept longer than 9 hours a night.

Watson and colleagues determined that for twins sleeping less than 7 hours, genetic influences accounted for 70 percent of the differences in BMI, with common environment accounting for just 4 percent and unique environment 26 percent.

For twins averaging more than 9 hours of sleep, genetic factors accounted for 32 percent of weight variations, with common environment accounting for 51 percent and unique environment 17 percent, the study said.

"The results suggest that shorter sleep provides a more permissive environment for the expression of obesity related genes," Watson said in a statement. "Or it may be that extended sleep is protective by suppressing expression of obesity genes."