OK, I haven't been keeping up with this thread, but I'll chime in.
I'm at the start of week 7 on Insanity. I started out a 6'1" 207 39-year old and I have no idea what I currently weigh. I decided that it doesn't really matter as long as I feel strong and like how I look. I'll probably weigh and measure myself at the very end to satisfy my taste for metrics, but I'm determined not to dwell on whatever they happen to be.
I don't mean to be a downer, but believe me when I say that the first month is just a warm up. I can see why a lot of people who had done Insanity told me they quit in the first or second week of month 2.
Having said that, they should have pushed through. I feel much more energetic after the first few workouts. I added some stretching and started eating a little more and my energy levels are a lot higher. The mid section feels tight and is reduced. I have a few minor pains (something that can only be described as a charlie horse in my left calf and a nerve twinge in my left groin) but nothing that prevents me from doing the workouts.
This workout isn't for everyone. If you absolutely, positively don't like to do squats or plank exercises (pushups, in-and-outs) you will not like month 2, but realize that the reason you don't like to do them is likely because you are not very good at them and/or strong enough to do them.
With only 3 weeks left, I'll muscle through to the end and get the t-shirt. I hope the weather is good enough to begin running more outside.
As for my diet. I do watch what I put in my body, but I'm not religous about it. I don't swear off foods, but I don't over indulge on sweets, high calorie drinks or alcohol. I like the 5 meals a day idea. The thought there is that you only eat to fuel your body. It's also easier to determine the # of calories you are consuming when your target goal is 300-500 per meal. If I were to eat 3 squares a day, then estimating 800-1000 calories is a lot tougher. Regardless, if I'm honest with myself, I know that it needs to be a diet I will stick to and if it is too big of a change right off the bat, I won't stick to it. Baby steps. I find that when I do overeat, I feel like crap. I detest that bloated feeling, so that is what keeps me on track and keeps me on the 5-meal plan.