John,
To survive parkinson's disease you must adapt. I now have five light meals, as I have five moments during the day that I take my pills.
It is not as difficult as it looks. Have a light breakfast at eight in the morning, some crunchy stuff at 11 dinner left-overs at 14.00, again some snack at five and dinner at eight. Plenty of opportunities to gain some weight I would say. Strangely I lost two kilo's.
Joop