No need to eat sawdust, you are conducting energy sapping activities so need to balance your diet accordingly. Chorizo and salami are a great source of meat as they keep well and have a high fat content thus giving you lots of energy. Their flavour can really enhance a meal, the german stores are worth a poke around in as they have various different brands and types of sausage. A bulb of garlic can also help with flavourings, and it weighs little. You could carry the chopped and crushed version available in tubs if you wanted though! Rice or pasta are more my thing, bluger wheat or cous cous is certainly not my bag but try it if you think it will do you. All will lend a bit of bulk to your diet, give you fibre and carbs. Chocolate, kendal mint cake (If you can handle the sweetness!) and GORP are great trail foods, as is a pocket of beef jerky to nibble on as you go. Porridge oats are very important and should play a part in everyones' diet if they like it! A bowl of porridge in the morning will keep you feeling full till early afternoon and give you a slow release of energy so that you can continue throughout the morning without faltering.
Keep an eye out on your travels though, stocking up as you go can be as good as a way of getting a good feed. Try local farms for a few fresh eggs or some meat. Many farm shops are opening up as their were grants in place for the farmers to take advantage of, and the recent programmes by the celebrity chefs and their endorsements to buy british meats from local butchers has made farm shops very popular. My local farm shop sells meats and eggs from the farm plus local produce such as preserves and jams, honey, etc. Many of the things would be a great addition to a basic ration you carry in.