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Vary Your Veggies
In one experiment, half the subjects were served carrots while the other half had a choice of carrots or celery. Only 69 percent of the first group ate their vegetables, compared with 91 percent of the latter group. It's not that celery fans are more common, says David Just, PhD: "Limiting food choices induces a natural tendency to rebel against restrictions. When we're able to make a choice, even a meaningless choice, we value the outcome more highly." In other words, by packing two veggies, you'll up your odds of eating at least one.