Why Frozen Yogurt May Not Be as Healthy as You Think

— -- What's better than a little froyo? And it's yogurt, right? Yes, but the amount of added sugar may shock you.

Nutritionist Maya Feller says even the plain tart flavor at your local frozen yogurt shop is "absolutely different" from the plain yogurt in the grocery store.

"With plain yogurt you're going to get protein, no added sugar, probiotics. Good choice. Really, really healthy," she said.

But "Good Morning America" looked at the nutritional information for the plain/tart frozen yogurt from five national chains. They averaged 18 grams of added sugar per 113 gram (4 fluid ounce) serving, with some as high as 28 grams of added sugar. That's equivalent to seven sugar cubes.

And there's another problem: Of the six local self-serve yogurt shops I visited in the towns of Oakland, Berkeley and Walnut Creek, California, none offered a 4-ounce cup. One provided a 12-ounce cup, but most had 16-ounce, 20-ounce, and 32-ounce cups.

But maybe people just serve themselves a modest amount in those quadruple portion cups? To find out, I went to a yogurt shop franchise in Walnut Creek and weighed the cups of yogurt people purchased before they took a bite. I found weights of 5, 6, 8, 10, and 17 ounces.

In the case of the 17-ounce yogurt, there were 1 to 2 tablespoons of nuts on top, so I adjusted my yogurt weight down to 16 ounces. Even with that conservative downgrade on weight, the added sugar was 120 grams. That's the equivalent of 30 cubes of sugar.

Feller put that in perspective, saying, "The World Health Organization recommends 15 grams of added sugar for kids, 25 grams for women and 37 grams for men per day."

And keep in mind we're talking about yogurt alone, before we even get to the toppings.

One yogurt customer told me she chooses yogurt over ice cream because she thinks of it as a healthier choice. She cited the fact that many frozen yogurt options are non-fat. But she also admitted that this perception is what she uses to give herself permission to add a few candy toppings, which roughly average 7 grams of added sugar per tablespoon (I used Gummy bears, brownie bites, Butterfinger and Heath bars to get to that average number). That bumps the added sugar numbers up even more.

When we compared the added sugar in the frozen yogurt to the same size serving of a higher-end international ice cream chain's ice cream, the frozen yogurt had twice the sugar. Granted, the ice cream had 17 grams of fat -- no small amount, but in a straight sugar comparison the difference was staggering.

So what can you do?

Tips for Eating Healthier When You Go for Frozen Yogurt

1. Visit yogurt shops that serve the yogurt for you.

In almost all of those shops I visited they offer 4-ounce cups.

2. Visualize 4 ounces. A 4-ounce serving of frozen yogurt is slightly less than the size of your fist.

3. Pile on the fruit. Once you put a fist-sized serving of yogurt in your bowl, if you want more and you want toppings, add fresh fruit and a few nuts for crunch.

4. Consider it an occasional treat.

I love frozen yogurt, but now I know it's not a freebie that I can indulge in all the time. When we reached out to one of the brand locations we visited -- certainly not the only yogurt brand with significant sugar numbers -- they offered that advice too: perceive yogurt as a "special treat."