One of my female housemates has a few strange habits, especially when it comes to food. She hardly eats and we are a bit worried about her.

I have only ever seen her eat two different meals, she will alternate between them during the week. Monday usually starts off with two grilled quorn sausages, boiled carrots and peas, two mini poppadums, four olives and a bit of ketchup. On Tuesday a boiled egg, a mini ciabatta, iceberg lettuce, cucumber and four olives get consumed. And then she goes back to the first meal.

These meals usually follow after three-hour sessions at the gym.

Her breakfast consists of a yoghurt and her lunch of a sandwich with some quorn thing and fruit. I have never seen her eat a snack or anything that contains more than 150 calories.

Our big fridge is full of nice food, mostly heatlhy but very tasty. Except for her shelf: lettuce, carrots, cucumber, skimmed milk and some eggs. Her cupboard contains a huge amount of sugar-free chewing gum, dried fruit and herbs. There is nothing there to make a meal with.

Once in a while, we go out for a bite to eat, although we don't do it very often as sitting next to someone who doesn't eat tends to make you feel guilty about actually appreciating yours. Last time, we went to a local restaurant to celebrate my birthday. The three of us tucked into our pizzas while she ordered a salad, minus the dressing and before she ate anything, she removed all the grilled vegetables and ate only a few lettuce leaves.

I know it is her body and she might feel comfortable at being that thin but we are all worried.

What I find incredibly bizarre though is that every night at ten she'll be in the living room watching an hour's worth of cooking programmes on UKTV Food, the home of double cream, chocolate cakes and roast dinners.

She also visits quite a few of the celebrity chefs' restaurants and gives them rave reviews, which baffles me even more. Why spend that much money on a meal when you'll leave most of it on your plate? Surely, that is more of an insult to the chef than anything else?

I just don't get it.