Any of the LC plans are safe for teenagers and preteens, as they don't restrict total calories. However, some teens may balk at the restrictions, and they may lose weight easily with a "looser" eating plan. It's not the first thing I'd do with a teen's diet, unless the teenager him/herself wanted to go fully LC to lose weight quickly.
I would cut out or severly limit portions of grains, rice, bread, etc. At the very least, cut out refined grains and only include whole grains, and serve the whole grains with protein and fat. I'd cut out or severely limit dried fruits, fruit juices, and other concentrated sugars. They've got to drink water to quench their thirst, and anything else is an occasional treat.
I would provide lots of meats (fatty is fine), cheeses, eggs, fish, and nuts to base meals and snacks on. I'd offer plenty of low carb veggies. I'd also offer moderate carb veggies and fresh fruits, and whole (not lowfat or skim) milk without restrictions. Basically I'd offer lots of whole, natural foods, and not worry too much if they choose foods that are slightly higher in carbs, as these are natural foods. I wouldn't allow unlimited grains though, as those can really mess up the "I'm full" system in a way that fresh fruit doesn't.
That's what I'd do at home and for any picnic lunches we pack from home, anyway. I would NOT fully prevent a 12+yo from having meals out with friends, the occasional treat from the ice cream truck, etc. But ice cream or chips once or twice a week isn't going to have the same dietary effect as ice cream, pretzels, and chips daily.
I'd also encourage them to be active, especially over the summer.
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