Hi, and welcome.
From everything I've read, the essence of weight loss is burning more calories than you consume (to a point, as you still need to fuel your body). I recommend you find a BMR calculator that incorporates your activity levels and work out your maintenance calories, and reduce them by between 500 and 1000 calories a day (as long as this number doesn't go below 1800 calories a day). This is from the site of one of the most illustrious members here:
Nutrition
I'd highly recommend close calorie counting (you said you were up for a rigorous weight loss routine). Buy yourself a set of digital scales (they don't have to be expensive), preferably ones that weigh to the nearest gram or ml (much smaller and so more precise units of measure than oz. or fl. oz.). Then find yourself a calorie counting program- I use one called cron-o-meter (see my diary, linked in my signature, for how it works):
Download CRON-O-Meter 0.9.7 Free - A tool which offers diet advice, track consumption and exercise, and generally assist in all aspects of a CR diet - Softpedia . Others recommended are Fitday (
FitDay ? Maintenance - currently down for maintenance) and
Free Calorie Counter, Diet & Exercise Journal | MyFitnessPal.com I personally pitch at maintenace -500, but am happy if I make anywhere between -500 and -1000. Maintenance -500 represents a loss of a pound a week (in theory).
Make sure your nutrition's right. There are some guides here (I'd recommend you read the stickies- see especially
http://weight-loss.fitness.com/nutrition/5534-nutrition-101-a.html ), but you should also find nutritional guidelines for your country. For muscle, I would emphasise protein (have at the high end of nutritional guidelines)- this will also help you stay full. Also remember- a lot of people don't seem to realise this- you need fat in your diet, just try to make it a healthier sort.
If you've got your nutrition in order, you can eat whatever and whenever you like as long as you hit that calorie target.
In terms of exercise, the more you exercise the more you can eat and still lose weight (or the more weight you'll lose- again, to a point, you don't want your calorie deficit to be too high). For prevention of muscle loss, strength training (weights etc) really is key. (Unfortunately some muscle loss is virtually unavoidable when you go into a calorie deficit, from what I understand, unless you've got a lot of weight to lose and have done little/ no weight training at all before). You may want to look at this thread (started by myself when I wanted to fix up my weight training) on what you should be aiming for with weight training:
http://weight-loss.fitness.com/weight-loss-through-exercise/48418-question-low-rep-high-weight.html
As to how realistic your plan is, my suspicion is you're overreaching for healthy weight loss- recommended weight loss is up to 1kg (2.2lb) a week, or 1% of your total weight (I've read both, I'm not sure which one you should prefer. Although anecdotally my GP is happy for me to lose up to 1kg a week and that's more than 1% of my body weight).
Hope this gives you some ideas
