gaz
Apols for deserting you back there ... being doing a 3 counties in 3 days tour (work) and my baggage got lost in the system, had me laptop with a flat battery but no power cable or dongle... or clothes or anything!
Basically it's brill that you're prepared to try new stuff, point I was making was you just need to start on the right-stuff that will be part of a sustainable healthydiet.
Thus finding products you like to substitute your current 'meals':
'Breakfast product' a good start, the milk is very valuable e.g. - Porridge/Oats So Simple, Oatabix/Weetabix, Fruit and Fibre.
Healthy snack/Fruit e.g. Oat/Granola bar, Apple, Banana, Orange
Lunch item e.g a sandwich or roll (brown Bread of course) + Yoghurt maybe 1 packet of crisps!
Evening e'g something quick, simple and tasty to cook say Cajun Chicken + Salad, Tandoori chicken + (brown) Rice, Beans on Brown toast + Cheese, omelette, Pasta + sauce, Baked potato + beans or Tuna/sweetcorn or whatever. Simple stuff but very scrummy!
Quick note on Rice, brown is good, but white much less so as it is high GI, it's pure starch, brown rice, the bran slows digestion and contains fibre goodies too. Pasta is medium GI because it's protein content slows it's starch breakdown. Brown bread good, white bad.
Avoiding large carb intake in the evening is also a good thing.