I agree with Christina Jonny. Get yourself a set of scales to accurately measure your Huel. If you are having around 1000kcal a day based on your weight, you should be losing fat.
We have a basic guide here that may help: https://uk.huel.com/pages/guide-to-fat-loss
If you are accurately tracking your calorie intake including all foods and liquids especially alcohol and sugar sweetened beverages, (MyFitnessPal is good for this) you know you’re at least 500kcal under what your body needs and after a couple of weeks you’re not losing weight raise this with your GP as something is not right.
This isn’t normal and goes against the laws of thermodynamics. An underlying health condition may explain a lack of weight loss however that would mean there is no calorie deficit.
From what I understand we aren’t totally clear on the reasons why stress leads to weight gain. However, it’s most likely due to changes in how the body responds to the environment rather than internal factors. More specifically, cortisol and chronic stress leads to a change in eating behaviours and calorie dense, palatable foods become from rewarding and so people eat more. It’s not because calorie expenditure decreases or the body increases fat storage from the same amount of calories.
There is a really good paper on this - more for the discussion and other papers it references than the study itself: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2895000/
Happy to be proved wrong though!