I'm 133 lbs at 5'9". I do cardio (jump rope, biking, running) and weight training. I was just curious, do I have to completely cut out junk food to get a six pack or can I have some occasionally, or can I have as much as I want (not that I want to, just curious)? Any information (as in depth as possible i.e. why junk food may be bad (insulin levels, etc.)) would be helpful. Thanks.