As a native English speaker, "one kilogram bread" doesn't really sound right.
Bread is a mass noun, and when you put an adjective in front of it, you should still be able to have any amount of it. You could have a little bit of rye bread or blue bread or delicious bread, or you could have a ton of it. However, you can't have 10 kilograms of 1 kilogram bread.
You are still able to say "a 200-pound man", since you can still have just one 200-pound man, or 500 200-pound men.