Unflavoured makes me feel full for longer

I’ve given Unflavored Huel Black a try and I was really surprised that it makes me feel full for longer. Not sure why? I’ve found that I have to drink it slower then flavored Huel, maybe this is a part of it?

Has anyone else found this?

There is marginally more calories per gram compared to a flavoured version, as there is no flavour or sweetener in the powder mix.