For most of this year, I have been becoming intimately acquainted with the downright pain in the arse (or more accurately, pain in the right upper quadrant) that is gallstones. I won't go into the gory details here, except to say that one impact this has had on my life is to make me cultivate an intimate knowledge of the fat content of everything in the supermarket. Gone are the carefree days of chocolate and pizza. Hello to foods whose names contain the words "Diet", "Light" (or "Lite"), "Good for you", "Healthy choices" etc ad infinitum.

My dietician gave me a very simple instruction: aim for foods with no more than 5g of fat per 100g, and an absolute maximum of 15g per 100g. At 14.4g of fat per 100g, these "Light" digestive biscuits are pushing the upper limit, but that's okay because my dietician gave me another rule to follow when it comes to digestive biscuits - stick to no more than two a day.

So with this ration in mind, just what sort of a treat are these low fat biscuits? They are slightly paler and a bit less rich and crumbly in texture than the usual full fat variety. As you would expect, they are also less rich and buttery in taste as well. On first taste they reminded me very much of Rich Tea biscuits rather than digestives, and I think the best way to describe the overall taste and texture 'experience' is as a cross between those two - the rich, comforting taste of the digestive crossed with the crisper, lighter feel of Rich Tea biscuits. Crucially for the dunkers amongst us, they taste just as lovely once dunked in your cuppa as the normal digestives do.

I've had these for a few months now to eat as an occasional gap-filling nibble or to dunk in my post-breakfast tea, and I can honestly say I don't have any yearning to return to the days of full-fat indulgence. I may even stick to them once my defective gallbladder is consigned to history, and I will be allowed (theoretically!) to eat whatever I like again.

Down to the nitty gritty, you get 2.1g of fat in each biscuit, and one will cost you 65 calories, so a snack of two with a cup of tea is reasonable on most diets. The package promises 30% reduced fat than the normal variety, and they are suitable for vegetarians. If sugar is your area of concern, each biscuit contains 3g, or 20.1g per hundred - I don't know what is considered acceptable but that seems reasonable to me in something sweet. Sainsburys.co.uk lists a 400g pack at 99p, which seems very reasonable to me. And when you are rationed to two a day, that pack lasts a long time!