Not that I ever go there but I just found this in yesterdays Guardian ....
"You know the new-style healthy Happy Meals - the ones that were going to woo the Jamie Oliver-loving middle classes back into McDonald's? Well, it transpires that to keep the carrot sticks crunchy, they will have been sprayed with hydrogen peroxide (once deployed as rocket fuel, now more commonly used for hair-bleaching products). And fruit portions will have been bathed in citric acid to prevent browning. Is any of this a surprise? Is this actually more harmful for health than dipping things in mayonnaise or tomato ketchup? Who knows? But McDonald's has responded with the promise that all carrots on sale in their restaurants will have been harvested no more than three days earlier. So that's all right, then. "
It's so nice what they're allowed to do with food. I wonder if the ready chopped veg you buy in Supermarkets has been treated with the same delightful er, ingredients!