Every sweetener has it pros and cons.
Natural sugars in all its forms (fructose, sucrose, etc) are generally cheap, taste good, but damage teeth, and can cause cravings (which can mean an over consumption of calories, and we all know the problem with that), and is addictive. It’s not solely sugar’s fault but over 64% of adults are overweight or obese and obesity related conditions are on the increase. Over 4 million people have diabetes, and over 15 million are classed as borderline diabetics.
“Obesity reduces life expectancy by an average of three years, or eight to ten years in the case of severe obesity. Around 8% of annual deaths in Europe (at least one in 13) have been attributed to overweight and obesity. The cost to the UK economy of overweight and obesity was estimated at £15.8 billion per year in 2007, including £4.2 billion in costs to the NHS”. https://www.noo.org.uk/NOO_about_obesity/obesity_and_health
Sugar alcohols are in general a pretty good, the main downside is they have a laxative effect and due to the their low score on the sweetness scale you need a lot, which is expensive.
Natural low calorie sweeteners (stevia, luohanguo, etc) are a good alternative, good for teeth, low calorie, and high on the sweetness scale (@IcyElemental stevia is 300x sugar not 200), the pros are there is some negative research on stevia, also stevia loses on tastes against sucralose. LuoHanGuo tastes a lot better than stevia but it’s not yet classified as food in Europe.
Artificial sweeteners are generally treated with suspicion. But lets not forget that not everything natural is good (deadly-night shade) and not everything artificial is bad (most modern medicine). We use sucralose which is zero calories, tastes good and has been extensively tested. It has been approved by the UK, EU, USA, Australia and Canada governments; in fact over 90 countries in total. There is a only a tiny amount in Huel, sucralose is 600 times sweeter than sugar. Read more here: http://huel.com/pages/guide-to-sucralose
Summary
As @IcyElemental we use stevia in the flavour pack so people who don’t want sucralose can buy unflavoured Huel and then use the flavour packs.