Hi Yoga, welcome! I'm doing JUDDD Primal LCHF, though my fat percentages have dropped a little in the last couple of weeks. My goal is HF I just don't always have the appetite to go with it, and my down days are just primal with an emphasis on lower carb.
My down days are pretty simple, which is actually a really nice side-benefit...I'm spending less on groceries.
Today is a down day for me and this is what it looks like:
Coffee with real raw cream (2T = 80 cal)
4 Slices of organic sliced turkey breast with a little mustard on each
Medium (about 190 g) Baked Yukon gold potatoe with just a rub of butter on the cut surface (counting the butter as .25 of a T)
Fage FF Greek Yogurt (190 cal)
The total calores are just over 500 calories. Edited to add: I've also done a down day with three hardboiled eggs, my mug of coffee with cream and the yogurt for dinner.
My up days are just regular eating days. Primal with a strong emphasis on HFLC. I'm not that hungry on my up days so the calories end up being between 1300 and 1500 calories usually.