Some info I found in a magazine:
#1 Instant soups can help warm you up in a cold freezing office.
#2 Take a good look at the label when buying:
For healthy intake, keep to 2.4g of sodium a day, and less than 2.4g if you have hypertension.
#3 Crunchy nuts like almond and pistachio are healthy snacks.
#4 Have some fruits on hand. Bananas contain three natural sugars - sucrose, fructose and glucose, and combined with fibre, a banana gives an instant boost of energy.
It's an economic and healthy way to beat the afternoon slump, compared to having your signature coffee.