RightSize is a tasty way to find the size that's right for you. A fairly affordable shake with a good percent of your RDI and low calories to boot. They also contain the patented hunger blocker, 'Appemine'.
Appemine's proven results aren't exactly where we want them to be, but it is definitely a great idea for people that do not struggle with caffeine. With a large variety of flavors there's little need to increase the calories by adding in unnecessary ingredients!