Hogwash - I don't understand this:
"so what else is left to eat? I noticed in the newsagents just now that another leading nutritionist talks about not eating low fat foods but eating high fat foods in 'moderate' amounts. So that's all carbs, most dairy, moderate to high amounts of protein and moderate amounts of fat out!"
I'm not sure if you are not understanding the concepts, or if you are catastrophising a little.
You may still eat vegetables and fruits - these contain carbs, but the lower carb veg and fruits are recommended as opposed to the higher ones, there is a list to help with this.
You may eat dairy foods, in moderate amounts, unless you find that they prevent you from losing any more weight (as some people on here do, I am not one of them)
You may eat high protein foods, in moderate amounts, indeed you need to as protein is an essential dietary requirement.
You may eat high fat foods - fatty meat, oily fish, eggs, oils, nuts (although again, not the carby ones) in moderate amounts.
There is still plenty to eat! I don't go a bundle on processed meats, or smoked anything, but I still have plenty of choice. It's just changing the mindset away from highly refined carbs - I still crave bread, just to have a bloody sandwich or some toast! because it's easy food - and increasing the fat content of your diet, AND increasing the amount of water you drink.
Does that help or have I made it worse for you, in which case I really apologise, I am sincerely trying to help.