@esmi134 Like John said, you still have to watch the calories on Fast 5. It is just easier for me to do when I'm only eating for 5 hours. A lot easier! Personally, I count my calories on a weekly basis rather than a daily basis. That gives me some to play with for weekends, a special dinner, or when I just have an overdo day.
With fast 5, make sure you eat enough to carry you through the fasting period. I'm a night eater, so this isn't really a problem for me. I eat, go to bed, then have no trouble at all getting to my eating window without hunger management problems. Like I've mentioned before, I tend to be the "once the first bite crosses my lips I want to keep going" type. That's why fast 5 works well for me. I find that I can manage my calories a lot better if I can eat something relatively substantial instead of trying to spread a skimpy calorie allowance over 16 hours... That's why it works great for my maintenance. I don't feel deprived.
I've found my maintenance is around 1700 calories a day. When you are maintaining or losing, it's important to know what your maintenance is. While there are lots of calculators that give an estimate, most find that it is a really individual thing. Use a calculator as a starting point then you'll have to determine your true maintenance by trial and error. At 1700 a day x 7 days, I have 11,900 calories a week to distribute. I eat about 1400 calories a day Monday through Thursday, which leaves me (11,900-(1400 x 4)) 6,300 calories for Friday through Sunday, when we tend to eat out and do things involving food. If I wanted to lose, I'd drop my weekly down to around 9800 which would put me at losing about 1/2 pound a week. You can cut more or exercise more if you want to lose faster.
I've been at the weight loss/maintenance game since 1995 when I lost 100 pounds. I find logging calories to be invaluable when losing and during the first years of maintenance. I use fitday.com (free version). After awhile, it becomes second nature to understand the calorie content of what you are eating, believe it or not.
When losing, watch your body's response. You don't have a lot to lose so you may not notice this as much, but as your weight drops so does the number of calories you burn every day. Every pound burns calories even when it is just sitting there, so your requirements change. They also change with age. I'm 54 now, and I've found that even though I still lift weights and exercise, my maintenance calories dropped after age 50. Anyway, if you stop making progress (while losing) or start gaining (while maintaining) you will have to adjust your calories.
Finally, while I know it makes no sense and shouldn't be possible, I've found that my maintenance is about 100 calories a day higher when I do fast 5. It was 1600 a day before and now it is 1700. Bonus!

Not sure what the mechanism is there, but I know it is true for me.
Another tip I'd give you is to eat plenty of protein. A lot of people don't get enough and it's important. It's your body's fuel of choice and it digests differently than carbs, so it keeps you full longer (in simplistic terms).
Hope this helps. If you have any other questions or I can help in any way, just let me know! Good luck to you and know that if I can do it, anyone can...