5:2 Diet

I don't know much about the 5/2 diet but I think the important thing is that you're still eating sensibly and healthily for the majority of the week. Many people fast on a regular basis and don't seem to have any serious health issues arise from it.

http://www.nhs.uk/news/2013/01January/Pages/Does-the-5-2-intermittent-fasting-diet-work.aspx

http://www.52fastdiet.co.uk/what_is_the_5-2_fast_diet.php

http://www.huffingtonpost.com/2013/03/29/michael-mosley-the-fast-diet-intermittent-fasting-uk-pbs_n_2977893.html

If you do a search for intermittent fasting I'm sure you'll find lots of information.

Atleast eat 1200 calories it's unhealthy to go way below that !!!

Pete is fasting for 2 days a week on 600 calories - the rest of the week he is eating normally/sensibly.

I know you are trying to help but, please don't give advice until you understand what it is the OP is asking for advice about.....

Pete - this would be the place to start if you need more information - http://thefastdiet.co.uk/

OP shouldn't leave vague questions with no details if OP doesn't want people adding their own two cents.

The TITLE of this thread is the 5:2 diet. How vague was the OP being? And how in the hell did you manage to click on it without reading what you clicked on? Maybe you should think about what you are saying before you go putting your 2 cents in.

There's a couple groups on MFP which have some very good information on fasting. 5:2 Group and Intermittent Fasting group.