Honestly? MTFU and don't snack. Eat at mealtimes.
I do the opposite - I don't have mealtimes. I eat little and often all through the day as and when, although this may coincide with breakfast, lunch etc. I never stuff myself and I'm never hungry.
As for the op - a handful of nuts or seeds won't do you much harm, as long as you aren't constantly at it between big meals.
Personally a typical day for me might go something like this...
6am get up - coffee
Sometimes a bowl of Alpen
9'ish - chicken breast quarter with skin off, at which time I'll buy a salad box consisting of:
Some mixed leaves, cherry tomatoes, cucumber, chopped peppers, greek salad (cous cous, feta, olives etc.), 3 bean salad and sometimes an egg.
This will just be munched on throughout the day when peckish.
I'll have some fruit at some point and maybe a bag of low fat crisps, or rice crackers.
Don't have a meal at night, but may finish the salad box at 'tea time', or maybe have a bit of fish based something or other.
Lost 2 stone and sat at 11.5st (6') - still drinking alcohol too