Did you know that snacking is a fairly recent phenomenon?  Snacking can help control overeating and improve your glucose control if you are diabetic.

https://www.delawareonline.com/story/news/health/2014/08/18/snack-ask-truly-hungry/14235229/

From the article: 

Research about food habits reveals that in the 1970s, 40 percent of Americans did not consume snacks. The most recent report? The number of non-snackers has dropped to just 4 percent.

So, do you ask yourself if you are hungry or do you just eat?  That's the key, keeping it for a snack when you are truly hungry.  Next time, do what the author suggests and ask yourself - Am I Hungry?