I have asthma so I can't eat much sugar, I'm not good with wheat, I don't drink alcohol and I don't eat dairy, but perversely that's encouraged me to be more adventurous. I now eat sheep's milk cheeses and lots of Indian, Thai, or Chinese food. What I eat depends very much on if I am filming Grand Designs, when I find myself condemned to eating pub lunches: fine unless it's one those places that offers 'breast of chicken stuffed with black pudding in a red wine jus'. Pubs should not be allowed to use words like 'jus'. I want traditional food like sausages and mash. It's far too difficult to find out if your food is organic or if you are eating a happy chicken or one that has suffered under a dreadful regime.

I start my day with four cups of weak, black Earl Grey tea, and porridge with rice milk, spelt toast (which my wife makes) and a big bowl of blueberries. But more often than not I wake up in a b&b, so I take my own milk and bread.

If I'm not filming I often go home for lunch. We have a farm and we're a foodie family - my eight-year-old son stays up especially to watch Gordon Ramsay. Everything is homemade - today, for example, we had a Thai-style soup with coconut milk for lunch, but it may have started out as something completely different in the same pot a few days ago. We grow lots of vegetables on the farm, so five or six weekends a year we can count on having a Sunday lunch where everything will be home-grown: organic lamb, vegetables, blackberries in a pudding and even cider - I look after two acres of cider apple trees. If you've got a bit of land it's very satisfying to eat from it.

On the week nights when I am home we eat together, depending on which of my four kids are around. I'm partial to egg and chips (free range and organic, obviously). My wife is a very good cook: if we've had a hot year then she uses our basil to make pesto. Sadly, if it hasn't been then we get none at all, as she refuses to buy it. We're eating lots of squashes at the moment, and we thought we'd planted courgettes, but they turned out to be mostly pumpkins. We've also been bottling marrows which my wife cooks in oil. They make a great addition to tomato sauce with pasta. I'm very lucky that we can eat well. It's important to me that it's all organic at home, and that any meat comes from animals that have had a happy life.

Porridge with rice milk

I find that rice milk is much better tolerated than cows' milk. Another plus is that this dish is based on oats which are less likely to trigger a bad reaction than wheat.

Blueberries

Blueberries are particularly rich in antioxidants, anthocyanidins and anthocyanosides. Likely benefits from regular consumption include improved eyesight and a reduced risk of cancer.

Earl Grey

Tea contains substances linked to a reduced risk of both heart disease and some forms of cancer, as does its chief component, water.

Blackberries

Like blueberries, blackberries are rich in anthocyanidins and represent a very healthy food, especially when picked fresh from the land.

Egg and chips

Contrary to popular opinion, eggs do not seem to have a strong link to heart disease . However, the chips offer relatively little in the way of nutritional value.

Pasta with marrow and tomato sauce

The vegetables in this meal offer more of a nutritional punch than the pasta. Kevin should opt for brown rice, or pasta made from corn.

Spelt toast

I have found in practice that spelt wheat is much less likely to trigger food sensitivity reactions than more commonplace varieties of this grain.

Sausage and mash

Cheap bangers tend to contain considerable quantities of wheat (rusk) to which Kevin is sensitive, and the mashed potato is pretty inadequate nutritionally.

Organic lamb

Lamb is less intensively reared and less chemically tainted than other animals . Go organic, or check that the animal is of assured provenance.

Thai soup with coconut milk

Coconut milk has a reputation for being rich in saturated fat. However, its lauric acid has antiviral and antibacterial properties, and may help protect from infectious agents.

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