Good question – I guess the answer is yes and no. Yes, orange juice would constitute breaking a strict water-only fast, but can happily fit into the 500 kcal allocation for a fast day, so shouldn’t be a problem as long as you track it.

I take iron, fish-oil and multivits on non-Fast days, but they make me feel queasy if I take them on a Fast day, so I skip them, as it’s only twice a week. I even had to give up milk in my tea on Fast days as I got really vicious hunger-pangs (as if my body registered the milk as food, although I’ve no idea if that has any medical/nutritional sense to it, it’s just what it felt like), so now I stick to water, black/herbal tea and miso soup until dinner-time, when I eat up the rest of my 500 kcals.

Maybe you could play around with it for the first couple of weeks and find out what works for you?

Good luck!