I can relate to this, hubby has high cholesterol, type 2 diabetes, high blood pressure, and is very inactive. I have tried nagging, coaxing, educating him, and all to no avail. He cant ( or wont) see the link between high sugar and neuropathy, high cholesterol and rubbish eating. Annoyingly he is the one who is a decent weight. He eats 3 decent meals a day, healthy, well balanced meals that I prepare. But then thinks nothing of coffee and 6 rich tea, or when I have gone to bed at 10 will eat crisps and whatever else he can find. Like other I supply healthy snacks, at a large cost to the budget, so he will eat a healthy snack and biscuits on top of it. He will buy and eat rubbish when out.
I am the one who has always eaten a healthy low fat low sugar diet, or as healthy as I can considering I have a long list of food allergies including raw fruit and veg, and dairy, and a swallowing problem, so I consume on average less than 1500 low calorie low sugar high fibre calories a day and am still obese. Never bothered me when I walked 20000 steps in a shift at work, cycled 100 miles a week and long dog walks every day, but now due to a long term asthma flare up I barely leave the house.