Seeds are embryos too (close enough). Fertilized seeds are like fertilized eggs in that they are single cell living entities. When that first cell starts to divide, the seed is called an embryo whether for plants or animals.
From an eating perspective, one cell zygotes as seeds regardless of form come with the nutrients necessary to give their plant or animal species the start it needs to have a chance to survive. Whether a sunflower seed, walnut, peas, potato eye, onion or whatever, if it can grow a plant or animal, it has nutrition. So except for the ones that carry some kind of poison to avoid being eaten, zygotes or embryos provide healthy nutrition.