Welcome Meg, am sure you will waste many a happy hour on here, as I do! I agree it's difficult to make changes when a partner doesn't feel the need. Is it possible that you can ask a friend to go with you on short walks, also there are supportive threads on here if you do decide to make some changes in your eating habits. Maybe start small with achievable goals to begin - good luck!
Have you stopped buying papers?
Retiring and living frugally in money from downsizing after years of stress


