What happens when today’s youngster get too little milk, sunshine and exercise? An anti-bone trifecta, that for some is leading to rickets, the soft-bone scourge of the 19th century.
But cases of full-blown rickets are just the red flag: Bone specialists say possibly millions of seemingly healthy children aren’t building as much strong bone as they should — a gap that may leave them more vulnerable to bone-cracking osteoporosis later in life than their grandparents are.
“This potentially is a time-bomb,” says Dr. Laura Tosi, bone health chief at Children’s National Medical Center in Washington.
Almost half of peak bone mass develops during adolescence, and the concern is that missing out on the strongest possible bones in childhood could haunt people decades later. By the 30s, bone is broken down faster than it’s rebuilt. Then it’s a race to maintain bone and avoid the thin bones of osteoporosis in old age.
“There’s some early data showing that even a 10 percent deficit in your bone mass when you finish your adolescent years can increase your potential risk of having osteoporosis and fractures as much as 50 percent,” says Dr. James Beaty, president of the American Academy of Orthopaedic Surgeons.
Already there’s evidence that U.S. children break their arms more often today than four decades ago — girls 56 percent more, and boys 32 percent more, according to a Mayo Clinic study.
It’s not just that they don’t drink fortified milk. Bodies make vitamin D with sunlight. With teen computer use, urban youngsters without safe places to play outdoors and less school P.E., it’s no wonder D levels are low. Because skin pigment alters sun absorption, black children are particularly at risk.
Rickets marks the worst deficiency, where bones become so soft that legs literally bow. Rickets was once thought to have been eradicated with milk fortification, but “I am now treating rickets in a way that I never treated it 20 years ago,” says Tosi, who diagnoses rickets or super-low D levels in children every month at a bone clinic she runs for mostly inner-city children.