The British and other European ones do. Things like a pack of mixed nuts and raisins, or a pack of fruit rather than just in snack bars.
I've used MREs quite a few times, as they used to be much cheaper in surplus stores and handy for camping. There seems to be a fundamental difference in approach between Europe and the US.
The US seems to value longevity most (10 year shelf life rings a bell, I could be mistaken), and it's reflected in the taste, with sawdust flavoured crackers etc. European ration packs are much shorter shelf life (2 or 3 years, again not certain), but are much tastier as a result. The European ones have a lot more in the way of known brands with decent tea, coffee, chocolate etc.
The French are most adventurous with things like rabbit, duck, pate, venison etc. British had the best curry and puddings. Also seemed the most generous - something like 4,000 calories a day. Lots of snacks and sweets too, I guess to bump the calorie numbers.