Puppies have different nutritional needs than adults. It is very easy to mess up their development by playing around with food and giving them something that isn't balanced for their needs.
A 7 month old should be eating a puppy food or possibly an ALS food. An adult should be eating an adult food or possibly an ALS food (although ALS foods are very questionable). Senior foods are pretty variable. Companies try to predict what may happen as a dog ages and make a food that would best fit the most likely disease processes (i.e. low protein because kidneys start to shut down, low fat because they are less active and obesity may come more into play). Major research goes into developing these foods. Then other companies that can't or don't care to do their own research just back engineer and try to copy.
I'd talk to your vet before switching a 7 month old to adult food.
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