Simple carbohydrates (sugar, glucose, fructose etc) are the main source of immediate energy. That is, they are metabolized easily and quickly. All our cells can use glucose for energy, so once it is metabolized and reaches the blood stream it can travel to other cells and tissues. However, lipids are good for storage.
The most important thing is to try and extinguish a fire if a fire extinguisher is near. If not, they second most important thing is to rush out of the lab using the fire escape route and call the local fire department which will then handle the situation.