Smoothies may seem like a nutritious start to your day or a great post-workout pick-me-up and some are, but most contain a lot of unnecessary sugar. Even though some smoothies, like the ones at Jamba Juice, have lots of protein and real fruit, they’re also loaded with sugar. If you need a smoothie, it’s best to make one at home, as even the Jamba Juice light smoothies (with an advertised 1/3 the sugar of regular smoothies) contain anywhere from 50 to 70 grams of sugar in their small 16 ounce cups.