This is hard to answer just as is. I mean are we talking survival? Are the said surviving meat sources also dependent on these 5? Does this include aquatic plants to maintain ocean life? Are we talking these 5 would be the only thing on earth? Obviously if that were the case the entire eco system would just die.
Most people are listing what they like to eat, and most are high in sugar. Corn and wheat are out the window as they have no real nutritional values other than energy and turn to sugar once ingested.
Me, I would go with the fallowing:
Palm tree - Very versatile. Shade, coconut meat, milk and oil, the bark and leaves can be used as building materiel, etc
Hemp - Food and utilitarian
Chick peas - Food, high in proteins,
Winter squash - Food source, Easily stored for 6 months or more.
Kale - Food source