Which plan do you use and how has it worked out with the use of phen?[/COLOR][/FONT][/B][/QUOTE]
I have used both and they both work well. Core is much easier in that you don't have to keep track of everything, you know what you can and can't eat and as long as you stick to that list you are all good. Flex does allow you to eat the sweets and carbs that Core might not, but you have to know the nutritional content of everyhing and figure out the points value and write it all down est.
In short, they both have their benefits, you have to do the one that best suits you and your lifestyle.