A lot of people like those little applesauce cups. Some are very high in sugar, though. I spent quite a while in the grocery store last week reading labels and comparing, and finally bought a 6-pack of Mott's low-sugar cinnamon flavored. Or maybe they're sugar-free with a little bit of aspartame - anyway they are just 50 calories each. I don't like super sweet stuff, and for me these are just exactly the right amount of sweet. I just ate one along with 7 reduced fat Triscuits for a snack and it was wonderful.
I got some snack ideas from the Flat Belly Diet that I like a lot:
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Homemade fruit smoothie fortified with 1 Tbsp flax oil. The flax oil adds about 100 calories, but it also makes it way more filling. You won't be hungry an hour later, like with some snacks. On the other hand, you really SHOULDN'T be, since it has the calories of a small meal (about 400 the way I make it).
A whole pint of grape tomatoes. I know this sounds crazy - who could eat a whole pint of tomatoes? But if you're on a diet and you're hungry - you'd be surprised how great they taste! A pint has only 60 calories, so you can eat them with an ounce of cheese to balance out the sweetness of the tomatoes. String cheese or those little individually wrapped Baby Bels are handy and portable.
Somebody said that fruit is "high in calories" but that really isn't true relative to the bulk. An apple is only 80-100 calories, for instance. What you have to watch out for is DRIED fruit. Nutritionally a raisin is exactly the same as a grape, but it's a lot easier to snarf down 50 raisins than 50 grapes. You have to watch the portions with dried fruit.
Even more so with nuts. Yeah, nuts are really good for you - in moderation. Unfortunately, I have a hard time stopping with just 10. I've found that nuts work best as snacks if I count them out and bring ONLY the amount I've decided to eat as a single portion. A bag of nuts in my desk drawer? disaster!
Same thing with chocolate, which has lately been discovered as a "health food" - provided you eat only the darkest chocolate and never more than an ounce at a time! If you can manage that, it actually is a pretty healthy snack, or so they say.