So I've taken a week off of the program after week 5 to let my twitch rebuild and tie up some odds and ends with school.  It's given me minute to reflect on what has gone on since I started.  Something that has come to my mind is wondering how detrimental things like caffeine are on nutrient uptake and such.  I'm from Canada and we have a nation-wide coffee shop called Tim Hortons where I'd swear they put something in it to keep people coming back.  Unfortunately, I am a loyal customer.  How tough is coffee on your system?  In the same genre, how tough is something like a can of monster or redbull on you?  Does it impede the progress of building strong muscle through overworking your kidneys?  I'd like to remain naive about it and keep guzzling a coffee a day but I'd say it's better to know exactly what is going on inside.