Nuts & Seeds are great compact fuel for the body.
Seeds are amazing little bundles that can be put in the ground and grown into full sized plants, and trees. As such they carry a lot of complex materials. They are therefore generally nutrient dense. This makes them easy to carry around for use on the go. Not only are they good for nutrition, they are also great sources of fuel for energy.
Nuts are also a great source of healthy fats. Healthy fats are imperative for a healthy body. Healthy fats help to balance our hormones (very important).
Another great thing about seeds and nuts is that they can be stored in raw form for long periods of time and not lose much in their nutritive value.