If you feel the need to snack, get something from the fruit bowl. Eat foods that slowly release your energy through out the day.
Drink more water, I like to add a slice of lemon and lime to mine.
Don't add additional sugar to anything. I don't add it to drinks or breakfast, unless it's already in the product, avoid adding extra. I do eat porridge for breakfast mostly, not the ready made microwavable crap, use actual oats and stick em in a pan.
I'm not healthy in the slightest, I eat too much junk sonetimes, I don't have a gym body but my weigh never seems to go above 10st. I'm a sucker for biscuits but generally I don't really eat chocolate in the form of chocolate bars, they get too sickly.
I just had a glass of milk and 3 slices of Brioche Chocolate Chip bread.
Also you could do anything like going out walking, takes your mind of thinking about eating junk.
Why are you feeling the need to change?