Question

do you think all nutrients can be make availble to us from one source of food?

Answer 1

yes. for example :
1) salmon
2) kale
3) seaweed
4) garlic
5) shell food
6) potatoes
7) sardines
8) liver

Answer 2

The additional foods are important because they: Provide nutrients that may not be available in the staple food. For example, legumes such as peas, beans and lentils add protein, iron and other minerals and fat; green and yellow vegetables and fruits add vitamins A and C, folate, and fibre.