Diet/recipe Help Please

I did read somewhere that protein is meant to fill you up better than carbs - so if he's eating chicken and fish, that could easily bulk up a salad- maybe a nicoise with tuna, egg and (not so many) potatoes.
Btw, I think I also read that sweet potatoes are not as naughty as normal potatoes (in this kind of diet)

Is he allowed to eat wholewheat pasta? I find that really tasty and filling.

Hmmm desserts..... can't think of any off the top of my head. Maybe if he's got to cut down on the sugar, just try to eat more savoury stuff in the main course. Or have a soup for a starter.
Fruit for a dessert could also be an option - you could make it more interesting. ie. slice fruit (apples/pears/peaches/plums/nectarines/whatever) and grill with (a very small sprinkle?) brown sugar, cinnamon. You could eat this with 0% fat yoghurt. Or a fruit salad with lots of fresh mint.

This is the low Glycemic Load eating plan that I've been following since the end of January.

The trick is to increase the amount of fat you consume. That fills you up and makes your feel full.

I start the day with a cooked breakfast. Bacon/eggs/mushrooms/tomatoes fried in coconut oil. The bacon I get is usually bacon pieces in a 1kg pack from Heron's. If it's lumpy bits rather than rashers I just chop it up a bit. The coconut oil is from an Asian grocers rather than a health food shop and costs me just £1- £1.50 a 500g pot. It's a good source of medium chain triglycerides and they break down into ketones very easily so encourage your body to burn fat rather than glucose so you lose weight more efficiently. I find I can last through to lunchtime quite easily after that lot.

Midday I have a salad from leaves picked from the garden, tomato onion cucumber grated carrot, grated celeriac watercress etc together with some protein (tin sardines in tomato sauce or half a tin of herrings in sauce or sliced up salami, corned beef, eggs cheese) and some coconut oil/vinegar dressing.
I like all my meals to have some low carb veggies/protein and fat content.

For my evening meal I'll have a good portion of fish or meat plus the usual 2 veg but instead of having potatoes/rice/pasta/bread I have another low carb veg. So tonight it was beefburgers with carrots, spinach, fried onions & mushrooms again it was all fried in coconut oil.

This talk by Gary Taubes explains why we need to ditch the low fat approach. He goes into more detail in his book The Diet Delusion

the case is also argued here

How about sugar free jelly? You could even add different fruits for a bit of variety.

Watch out for 0% fat yoghurts as they are often packed full of sugar.