"I'm fasting so I don't have energy"
I mean you can and it might even be true and sometimes you might just have to allow for that xD
but obviously better if you can mitigate it
My coach has had to ask a couple of her gymnasts that as they are half dead by the time they get to her at the end of the day.
I don't think I've tried avocado in a smoothie and part of me wants to try but part of me feels like I wouldn't like that particular flavour as a drink XD

Ah! I thought this smoothie is known in Malaysia as well! I saw some people posted similar smoothie in Thailand and Vietnam, hence I thought Malaysia would have it as well 😅
They probably do but my mum is not much of a smoothie person so wouldn't have made it while I was growing up, and I was a super fussy kid so I wouldn't have tried it if we'd seen it while hollidaying in Singapore/Thailand/Malaysia because I would have probably thought it looked weird/unappetising (I have seen green smoothies there but due to aforementioned fussiness never bothered finding out what was in them).