Teens, take note: Two studies out Friday look at how drinking sugary beverages impacts your weight.

One study shows that heavy adolescents who stopped guzzling sugar-sweetened drinks for a year — not too surprisingly — gained 4 fewer pounds than their peers who continued to drink them.

The other documents how both soda and sports drinks impact weight gain.

“We regularly see children and teens who are consuming hundreds of calories a day in sugary beverages, not just soda but energy and sports drinks, which are also loaded with calories,” says David Ludwig, senior author of the new study and director of the New Balance Foundation Obesity Prevention Center at Boston Children’s Hospital.

In fact, a recent government analysis showed that teens who drink soda, energy drinks and other sugary beverages are guzzling about 327 calories a day from them, which is equal to about 2½ cans of cola.

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