Greek yogurt is a great choice. High in protein (which will help you feel full - aside from its primary function in the growth and repair of all your body's tissues!) and low in carbs, sugar and sodium, a serving of greek yogurt is a perfect snack for work. You can certainly buy individual containers of low-fat greek yogurt, but more economically, keep a large container at home and fill a plastic tub to bring to work. This way you can fill a second tub with some muesli and / or cut up fruit. Throw them all together at work and you have a snack that's high in protein, contains whole grain complex carbohydrates delivering fiber and has a variety of vitamins & minerals. A complete snack. No nougat.
Ye ol' Granola Bar can be a good choice too. And I say "ye ol'" for a reason - most granola bars you find on the supermarket shelf contain a large amount of sugar - they're really cookies. (Look, I love cookies, but when I eat one, I don't pretend it's health food!) Nature's Valley granola bars have 3 types of sugar on the ingredient list. The bars on the shelf at the health food store contain a lot of sugar, too - they just describe it differently. The first ingredient in a Clif Bar is a sugar, in the guise of Brown Rice Syrup ... and then there's Barley Malt Extract = sugar, and 3! listings of Evaporated Cane Juice - which is fancy for sugar.
Making your own isn't hard. Make a batch, wrap them up individually and feel good about ye ol' Granola Bar.
2 cups of oats
1/4 cup dried cranberries - roughly chopped
1/4 cup dried apricots - roughly chopped
1/2 cup coconut flakes
1/4 cup sesame seeds
1/4 cup pecans - roughly chopped
1/3 cup rapeseed oil
1/3 cup runny honey
1 teaspoon vanilla
1/4 teaspoon cinnamon
Put oats, dried fruit, coconut, seeds, nuts into a medium bowl.
Pour wet sticky mixture onto dry ingredients and stir to mix well.
Put baking paper into a small baking tray with sides. Rub a little of the rapeseed oil over the paper. Push your mixture onto the tray to compact it.
Place in an oven heated to about 160ºC (140º fan oven) and bake for about 20 minutes, until oats are golden brown.
Remove from oven and let cool completely before removing from tray or cutting. They smell so good this will be hard - but it helps to keep them from falling apart.