It's amazing how you can perk up the humble mashed potato with the odd vegie. Try making Colcannon (potato with chopped cabbage mixed into it). Or add any greens like peas, spinach or chopped runner beans.
Instead of fruit and yogurt for dessert, try blending some fruit, natural yoghurt and fruit juice with a little honey to sweeten for a delicious smoothie. Good combinations are strawberries and banana, peach and raspberry, and mango and passion fruit.
Instead of using jars of tomato pasta sauce, make your own simple, but vitamin-packed, version. Stir-fry onion, garlic, celery and peppers with any combination of broccoli and eggplant, add some mixed herbs and a tin of chopped tomatoes. Then puree and stir in some pasta twists.
Try setting some soft fruits in sugar-free jelly for a party pudding he won't refuse.
Can be hidden in omelettes. Cook them first by either boiling or stir-frying, then scatter them over a just-cooked omelette before you fold it. Sprinkle cheese on the top and grill lightly.