My main breakfast, lunch and dinner have always been quite healthy as I mostly cook from scratch. This is due to habits from the past of being on a low wage and needing to save money, but has always stuck with me. I'm more financially secure now, so the COL hasn't meant I need to cut back on my regular weekly shop.
However, I've really cut back on eating and drinking out, as I find the prices for certain things eye-watering - £6.50 for a pint, £20 for a roast dinner, £50 for an Indian take away for 2, £10 for a sandwich and some crisps on the side - so this has made me healthier. I refuse to pay that much unless it is a special occasion. I'm not even in London or South East.
So I'm eating and drinking less junk: When I go out I just have one drink, instead of several. Or me and DH will share a large portion of fish and chips. Or we'll spread a take away over a two days via having a smaller portion. We also do this less often. At one point, pre covid, we would have several take aways or meals out at week. Now a takeaway is something shared, once or twice a month max. Meals out in a restaurant have recently only been due to special occasions (probably once per quarter) or when we're away from home on holiday etc.
Covid/lockdown also helped to shift my habits, inflation has pretty much stamped it dead. I can have a nice time at home or alcohol free. My wages haven't risen in line with inflation so I find the cost of eating out especially shocking, as it seems to be rising at a greater pace than average.