Mailnutrition is usually when you're not eating enough food or a balanced enough diet to stay healthy man, drinking redbull isn't going to cause malnutrition unless its the only thing you eat/drink all day. Malnutrition basically means starving yourself. To answer the 1st part of your question, i've been drinking 2 bottles of redbull a day for a looong time. I still get the same buzz after almost 1 year of drinking redbull. My girlfriend likes to get Redbull enimas, and i don't mind because it means I don't have to clean out the litter box for another day. the molecular bonds in Redbull have been known to strengthen the walls of the colon, which is why so many thai pornstars now get Redbull enimas done twice a day, usually at an enima cafe or massage parlor.