Here is the source of my recipe for seed mix for my Diabetic Dwarves. Actually, I feed ALL my dwarves this seed mix. "Bulk Barn" is a store that sells food from bins with scoops and you buy by weight. I don't know what kind of stores are in Europe. Maybe someone else can help you there.
Check out the article on Diabetic Hamsters on this site. You will have to reduce this seed mix recipe if you only have a couple of hamsters.
Seed mix source:
http://www.geocities.com/knottyceltic/hamsSeedmix.html
I buy Fenugreek Seed capsules at a store that sells homeopathic medicine like vitamins etc.
My personal recipe for fenugreek tea is:
4 capsules (600 mg each) of Fenugreek Seed Powder
1 cup (250ml) of water
pinch of sea salt (look at ingredients to make sure sugar is not an ingredient added to salt)
another 1 cup (250 ml) of water
Put 1 cup of water in a small pan and open capsules and sprinkle powder over the water. Stir it up and heat water to boiling. Watch it carefully as it tends to foam up and boil over. As soon as it boils, take the pot off the heat and add the pinch of sea salt. Let this cool. Strain the tea through a wire strainer, I use a tea strainer, to remove jelly-like fenugreek.
Then add one more cup of water. Stir it up and store in a clean glass jar with a tight fitting lid. This must be kept in the refridgerator. This recipe is enough for about one week. It should smell sweet. If it begins to smell bad, then throw it out and make a new batch.
Do not try to put this in a water bottle. The tea turns rotten very quickly. Use a small ceramic or glass bowl and make sure you give fresh tea every day, washing out the bowl each time.
This should be the hamsters only source of water.
Test your hamsters sugar levels every couple of days until it tests negative for any sugar at all.
Once you have stabalized the sugar levels you can check their urine once a month or so.