Is there ever an occasion when a healthy adult should eat without feeling hunger?

My metabolism has changed lately and I rarely if ever feel hungry. If I do feel hungry in the middle of the day and grab a quick snack (say half a dozen Triscuit crackers with cottage cheese – a fav), I’m done for the day. Likely I won’t feel hungry again that day.

Today it’s 1:00 p.m. and I’ve had no hunger yet today, and I’ve been up since 7:00 a.m.

I’m a reasonably healthy, fairly active male in my mid 50’s.
I’ve taken some probiotics recently, with no noticeable effects.

I know the whole ‘breakfast kick-starting your day’ thing has been cast into doubt, so I want to know “When should I eat?”