Im so sorry to hear about your husbands condition and your own frustration level. Have you looked into mental health options???

...there may be an emotional component to his eating ( usually anxiety/worry/fear) that has been driving the sweets compulsion....some SSRIs (anti-depressants) can be easily tolerated by older adults, or a low dose BENZO (anti-anxiety) to address his behavior at the TRIGGER point.

You could also look into support programs and group therapy, possibly a mens group. Isolation in older males is a huge quality of life issue, and he may be using the sweets as a form of self medication.

Take Care