The problem is that everyone touts their own personal beliefs, or what worked for them personally, as the gospel truth that will work for everyone. In reality there’s lots of different, and conflicting, diet advice that needs tailoring to a specific person, depending on their body type, their food triggers, and why they’re fat in the first place (emotional reasons, ignorance, time pressures, etc).
Low carb works really well for me, but it’s not going to work for someone with a sweet tooth, for whom the thought of a life without biscuits is unthinkable. There’s no point telling those people to load up on fats if they’re going to eat bacon and eggs for breakfast, pour extra cream in their coffee, and then crumble mid morning and eat biscuits - they’ll end up fatter.
That person might prefer fasting (5:2, 16:8, or intermittent fasting), or calorie counting (WW), or food combing (slimming world - I don’t know much about this one and it sounds a bit mad to me but others swear by it). Most of these diets work if you can stick to them, but that’s a pretty big fucking if.
I miss potatoes and often fail, but I know it’s the right diet for me so I get back on the wagon.
The NHS doesn’t seem to have this sort of tailored advice readily available. It also seems to struggle to diagnose and treat complex endocrinology and/or food intolerance issues that can cause weight gain. Under active thyroid can play havoc with people’s weight, as can a number of hormone deficiencies which make people tired, and fuel themselves with sugar (I put on more weight on maternity leave than I did in pregnancy for this reason, despite not having a sweet tooth).
There’s also not much point taxing biscuits and banning offers if you’re not going to tackle the issue of food deserts, where many people live in places with only small expensive convenience stores with limited access to fresh fruit and veg. Or live in B&Bs and other inadequate accommodation without proper cooking facilities.
I do miss potatoes