If it helps, when I had a full meal with little water, 3 and a bit scoops, 500ml water ( 1:4 ratio) I felt sluggish after, but after an hour the longer term energy kicked in. When I mix more to 1:5, the sluggishness stops and its pure energy.
Since being on Huel I’ve had more energy, motivation and get-up-and-go than I’ve ever had in my life. It’s no secret I’ve never had a good diet, so it’s more that I’m now getting everything I need than some magick potion in Huel, but to have everything in a simple, quick and easy place, means no reason to skip meals, no need to count anything or fuss around with anything. Simply measure water, scoop in and shake. And it tastes great to boot. What’s not to love!