sweetheart, naturelover is right, 1480 kcal on non-fast fast days is too low for you.
The guidelines are 500 kcal on fast days and normal eating on non-fast days. The 500 kcal figure is arrived at from taking 25% of the 'average' woman's daily calorie needs. 'Normal' eating is really meant to mean eating the number of calories your body needs to maintain the same weight, so not dieting and not bingeing. I suspect 1480 kcal in your case is a diet ration so not enough for your non-fast days.
Personally, I have never counted calories on a non-fast day. Yes, I did end up stuffing my face on non-fast days for the first week or so, but after that it felt like someone had pushed a reset button in my head. Now I naturally want to eat the right amount of healthy food (I still enjoy a treat or two sometimes though, I'm not a total robot!
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If you want a calorie guideline though you could work out your daily calorie needs by following the TDEE (Total Daily Energy Expenditure) link in the OP on the latest 5:2 thread. This factors in your height, age, weight and level of exercise over the week to give you a daily calorie needs figure. Aim to eat roughly this amount on your fast days, you can go a little below it some days and a little above it others, the point is to average this amount over all of your non-fast days. Because your TDEE factors in your exercise you don't eat extra calories for doing extra exercise.
Some people prefer to say they are sedentary when working out their TDEE and then eat that plus their exercise calories on non-fast days. If you choose to do this you still don't eat your exercise calories on fast days because the principle is to eat 25% of your energy needs on fast days. If you want to use exercise calories to 'earn' more calories on fast days then at most you should eat 25% of your sedentary TDEE plus 25% of your exercise calories. Most people find it less hassle to just stick to the 500 kcal guidleine though.
I've been doing 5:2 for 5 months and only just took up runnning a week ago so I avoid exercising on my fast days, but as you're a regular exerciser your body is used to it. Many 5:2ers do exercise on fast days and don't have any problem doing so.
I hope this helps you.
Please do come and join in on the main thread as it's a good source of encouragement and information.