Why not make a nice big pan of stew? It lasts for days, and tastes better than any supermarket ready-crap does. The making it gives a break from work (though not too long), and helps rejuvenate the soul. To accompany my stew I use lumps of home-made bread made with Lidl ready to bake packs - dead easy and tasting authentic. If you're studying you need proper food. Too much crap, too many take-aways doe shave an effect, believe me. I find the easiest way to wean myself off crap is to read the ingredients label. Sausages with 45% meat - no, ta. Mechanically recovered chicken? . Umpteen additives... you get the drift.