Hi Val,
Juddd is pretty simple and relatively easy to stick too as long as you have your motivation
There is an Up Day where you eat normally (as long as you don't go ott and eat too much) about 2000-2500 cals although you don't need to calorie count, although lots of us do just to keep in check.
Then you alternate that with a Down Day which is basically 500 cals max. You can either do this with food and strict calorie counting, or CD or SF products etc. I use food usually and split it down into 5 x 100 cals meals/snacks. it is surprising what you can have for 100cals when you look around. Also many find it easier to leave eating until as long as poss in the day, usually around 2pm for me. Plus make sure you're drinking at least 2 litres of water, tho the more the better (I usually have 3.5 or 4 litres a day).
You can visit the juddd website at:
UpDayDownDay Diet™ Plan – How to Succeed
There is a calculator but it is just for guide (esp the up day cals) so you don't have to stick to this. As long as you aim for 500 and 2000 you'll be losing those pounds.