Weight gain following a stroke

Hi all, I am nearly  5 years post stroke.   I have never been  over weight  and when I was finally discharged  from hospital  after 5 months,  I had lost over a stone and was far to thin. However,  although we are quite  healthy  eaters, I'm  now  finding  my weight  going slowly  up in the  wrong direction.  Weather  permitting, we go out walking  most days and with my husband's help  I do as much exercise  as I can. Does anyone  have any tips for keeping  weight  down, I would appreciate any tips and advice. 

Regards Sue