Its basically saying that consuming sugar during active times (during excersise) is best than consuming sugar products any other timep; at the desk, watching tv, ect. They have to be vague because its still a study and people take things to literally and if it doesnt work they blame them others for it. It sounds obvious to some but as a trainer there are alot of people who dont think that way they figure oh i worked out so i can do this and this and it wont be bad for me.