The overall rule for 5:2 is the same as with everything else. Consume fewer calories than you burn. The 5:2 for some just make it all more accomplishable.
If you simply count calories, then you can always eat anything you like. You just have to fit it into your food diary.
Doing the 5:2 can make the "feast" days more enjoyable - but be careful. It's NOT a free-for-all, and if you have a problem with overeating to begin with, then it can easily get you in trouble.
If you can control it, then it's a great tool.
"Losing weight is never about eating as little as possible"
"You wouldn't worry so much about what others think of you if you realized how seldom they do.
― Eleanor Roosevelt
"Do. Or do not. There is no trying."
- Master Yoda.
From October 4th 2010 to April 3rd 2012 I lost half my body weight - 80 kilos/170 lbs. Since then, I have had two cosmetic surgeries to remove excess skin. I have now quadrupled my strength, gained several kilos in muscle mass, and today I focus on building muscle, optimizing my diet, and living healthy. I am stronger, healthier, thinner, happier!