I am lucky. I started atkins first and lost 30 lbs with it.
But it gave me a great way to eat.
heavy carbs/refined sugar are the enemy. I don't care what plan you are on, those are the bad boys.
if you can allow a few of them into your UP day then ok. But know your trigger foods. I know what I can and can't ever let back into my life.
go heavier protein and good fats. they are very satisfying meals. you don't 'hunt' for food as much as that and you aren't monkeying with the sugar levels and cravings after.
I just started Juddd. One thing I know the first 2 UP days were out of control. I thought I could 'have it all' NO YOU CAN'T. You have to KNOW YOU. KNOW what you are capable of eating and what you must avoid and then allow some of the extras in to make ya happy and enjoy eating.
When I tracked every single calorie on my UP day is when it became clear to me that JUDDD will only work if you eat properly. the DOWN day is great for calorie deficit but if you apply sound and healthy eating to the UP day the benefit is greatly increased.
best of luck to you.
remember the UP day must be worked. worked hard like any old healthy eating plan. hope some of this helps you

I know I am still working my way thru it all also