The macro ratio of Huel is basically 40% carbs, 30% protein, 30% fat. The general feeling I get in nutrition circles is that this ratio is too strongly associated with the ‘western diet’ i.e. moderate carbs and fats.
Obesity aside (impossible without calorie excess or a medical issue), I’m concerned that this ratio encourages insulin resistance, inflammation and encourages development of NAFLD (Non-Alcoholic Fatty Liver Disease) due to high triglycerides due to a conflict of energy sources - I’ve noticed that of the few blood test reports for people using Huel long term or consuming a mostly Huel diet, they report high trigs.
Well known advocates of plant-based/vegan diets like T. Colin Campbell, Fuhrman, Michael Gregor, McDougall etc all encourage a low fat, high carb diet for this reason. Yes we need fats for various functions, but the level of fat needed is very low (mainly for absorption of certain fat-soluble vitamins).
Alternatively, a high fat, low carb diet would also be acceptable to prevent the conflict of energy sources, prevent blood sugar issues and prevent development of NAFLD.
The longest living populations in the world are typically low fat/high carb (the Adventist vegans in US, Okinawans) -OR- high fat/low carb (e.g. Maasai). No studies have shown that a moderate/high carb and fat intake is associated with a longer or healthier life. The only exception seems to be extremely active athletes who requires high carb and fat for energy.
In fact, apart from the NHS and various other national health authorities in other countries, I don’t know of any experts in the field of nutrition that encourage a balanced/moderate macro intake - most encourage either low carb/high fat or low fat/high carb. Most are still basing guidelines on decades old studies and not recent research.
In my opinion (and probably many others), Huel would be far better with much reduced fat content (perhaps around <4g total fat per 100g), or a ketogenic/low carb version (<4g net carbs per 100g).
Would be interested in @JamesCollier 's thoughts.