I try to snack on fruit and super free veggies like pepper strips etc but if I'm honest I find it's best if I munch on lean protein. Fills me up better. I'm hungry again an he after an apple! I tend to grab a slice of ham beef turkey (sliced deli type stuff) crab sticks, hard boiled eggs, baby bell lights are 3 as a HexA and disgusting woman that I am......jars of cockles lol. A few slices of cucumber, onion and radish in a dish with a splash of vinegar is nice for picking at.
Try making your snacks special. A few slices of melon wrapped in smoked ham, a lettuce leaf 'wrap' with cottage cheese and chopped spring onion. Oven roast some cherry tomatoes peppers shallots etc with garlic rosemary and balsamic, then roughly blitz for a quick dip to dunk your crudités. Fresh mango salsa with cold leftover chicken. If you take a bit of time and effort over the snacks you'll enjoy them more. I struggle with mindlessly grabbing an item and gobbling it down without really registering that I've eaten it!!!