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I believe that they selected products, e.g. hash browns and orange juice, and, for recovery they found that the results were the same - the sports products weren't providing more of an effect than their nutritional content (which you can mirror to quite a good extent with selected fast food).
No suggestion that typical fast food is as good... until we reach hallowed publications such as the mail online:
"Hooray! You CAN eat fast food after exercise: Burgers and chips are just as good as supplements for workout recovery, study claims"
Sorry but I have to agree with @StephendS here, there is no way that a burger or chips that have been uber-processed from high-intensive farming produce, and then cooked in a big deep fat fryer in a fast food restaurant, is going to mirror the nutritional value of a sports supplement. If you equate the generic labels 'fats' 'carbs' and 'proteins' then maybe, but that's certainly not how to do nutrition - if it was, then you could eat 100g of popcorn and say that was just as good as a plate of pasta...