Basically the idea is that you eat a massive amount of calories in one day to kickstart your metabolism and confuse your body so that it doesn't get used to getting very few calories.
No. Not a "massive" amount. As kingkeld explained, it's a redistribution of your weekly calories so that you eat at a lower level for 6 days & bank the extra calories to be eaten all on the 7th day. Across the entire week you should still have the same total deficit.
It absolutely works if you can do it, but it's not for everyone. The spike day is supposed to be no more than 2x your BMR so you have enough calories for the rest of the week.
I would recommend you do a little homework on WHY it works before you go off half-cocked trying something you read about on a weight loss website. I did follow The Spike Diet for quite a while & loved it. Go to Amazon & look for the book by Russell Branjord. I picked up my copy at a discount bookstore. It's a quick & easy read.
| NO EXCUSES, JUST RESULTS
| Next milestone - 256: 60 lbs lost2013:
still up from 1/1, but coming back down...2010:
50.4 lbs lost | 2011:
17 lbs lost | 2012:
1 lb gained
How I did it: http://stubbysticks.wordpress.com/weight-loss-summary-by-month/