At shops like Jamba Juice, most smoothies aren’t just fruit plus milk or yogurt. They often contain sugary sherbet, juice, lemonade, frozen yogurt, etc. So even the smallest sizes typically start at 250 to 400 calories. In other words, they just can’t beat the smoothies you whip up at home. Here’s our DIY guide. Short on time, or on the go? We've also picked out some of the best bottled smoothies and shakes.