In that age range, girls are just hitting puberty. It is a period of faster growth than any other time in their lives since infancy. Limiting calories is therefore not a good idea for girls in that age group, since their bodies need extra energy in order to grow, unless they are having health problems due to weight. Making healthy dietary choices and getting plenty of exercise are good ideas. Just keep in mind - the belly fat that many girls accumulate early in puberty tends to move elsewhere in their later teens.
Spending more time in the kitchen can help you shed belly fat, as long as you’re cooking with the right foods, according to one 2017 study. After analyzing data from more than 11,000 men and women, UK researchers found that people who ate more than five homemade meals per week were 28 percent less likely to have a high body mass index, and 24 percent less likely to carry too much body fat than those whole only downed three meals at home.

An easy way to determine if you have too much belly fat is to measure yourself at home. Take a measuring tape and wrap it around your bare stomach, directly above your hip bone. The tape should be snug but not too tight. For women, a measurement of 35 inches or more indicates an unhealthy amount of belly fat. For men, a measurement of 40 inches or more indicates an unhealthy measure.

And how often to work out to get rid of belly fat? Well, as you know, too much cortisol can counteract your belly fat loss efforts. Belalij suggests doing 30-minute sessions, three times per week. “As you start to lose belly fat your body will want to cling on more and more to what is left, so you must increase the intensity or duration of your workouts, the more fat you lose,” Belalij says. And Hughes agrees:
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