Kids Who Diet: When Are They Too Young?

Why dieting in childhood is risky.

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Late last year, actress Ginnifer Goodwin, 32, made headlines after revealing she joined Weight Watchers when she was 9. Though critics said she was too young to diet, Goodwin defended herself and the program: "I went to weekly meetings, got counseling, and would exercise with my peers who were my size," she told People magazine. "It was the first time I saw a proper children's portion size, and it wasn't two burgers, it was one."

Indeed, children as young as six and eight hate their thighs, bemoan their chubby bellies, and long for leaner legs. Nearly half of boys and girls in grades three to six want to be thinner, research suggests, and about 37 percent have already dieted. Often, they’re spurred by mocking at school or parents who push weight-awareness at an early age.

"Fat has become the boogieman of our time," says British Columbia-based eating-disorder counselor Sandra Friedman, author of When Girls Feel Fat: Helping Girls Through Adolescence. "Kids are counting calories before they even have any idea what a calorie is."

Most pediatricians plot a child's body mass index on a growth chart, starting at birth, because of the health consequences of weighing either too little or too much, says Seema Kumar, a pediatric endocrinologist at the Mayo Clinic. Obesity in childhood, for example, is linked to diabetes, heart disease, hypertension, asthma, and sleep disorders. Those kids, Kumar says, are typically directed to approaches like supervised diets, behavior modification, and intensive exercise.

But if health isn't an issue, most experts warn that the word "diet" shouldn't be used with children or teens; the emotional and physical consequences are too risky. In one study, researchers asked normal-weight middle school students if they intended to diet in the future—and when they followed up a few years later, those who had said "yes" weighed more than the non-dieters did. "The act of dieting, for the most part, leads to further weight problems," says registered dietitian Melinda Johnson, a lecturer in the nutrition program at Arizona State University. "It's not appropriate for the vast majority of kids to go on a weight-loss diet."

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Dieting in childhood can lead to physical problems that may prove difficult to reverse, even years later. One of the most common issues is vitamin and nutritional deficiencies. Stunted growth, delayed puberty, and osteoporosis become real concerns when kids follow restrictive diets that don't meet their nutritional needs. Bones grow rapidly during childhood, for example, typically reaching peak mass by age 20. Kids who skimp on calcium are inviting brittle bones that break easily.

For children, almost every dieting approach can be problematic:

  • If it supplies too few calories, even a balanced diet can stunt growth and development; for girls, that could mean delaying or temporarily stopping menstruation.
  • A diet that skimps on protein may hamper muscle growth, while too little fat can block absorption of vitamins A, D, E, and K, says Melina Jampolis, a physician and nutrition specialist in California.
  • Underweight children with a low percentage of body fat may have weakened immune systems, leading to more frequent and persistent illnesses.
  • Low-carb diets discourage foods like potatoes, which provide iron, potassium, B vitamins, and vitamin C—all essential for the body to work at its maximum ability. And some studies suggest that low-carb diets may affect learning, concentration, and school performance, since carbs provide energy and help people think clearly.
  • Early dieting can also promote chronic body image problems, yo-yo dieting, and eating disorders. Anorexia or bulimia can both stunt growth and cause serious illness, even death. What's more, nutrition experts worry that restrictive or fad diets don't teach children healthy eating skills they can rely on for a lifetime. "They're not learning how to integrate healthy foods into their daily menu," Johnson says. "They're just going on a diet, and when they go off it, they're going to return to their original eating patterns."