Here are the various low-calories and low-fat snack (about 150 calories per serving) which you can eat without guilty and don’t get bored:
1. Strawberries with Chocolate Sauce
1 cup strawberries drizzled with 2 tablespoons chocolate syrup
2. Apple and Peanut Butter
1 medium apple, sliced, with 1 tablespoon peanut butter
3. Oatmeal and Berries
1 packet low-sugar oatmeal topped with a handful of berries
4. Spiced Maple Yogurt
Spiced maple yogurt: 6 ounces plain yogurt, 1 tablespoon maple syrup, and a dash of cinnamon
5. Chocolate Pudding
1 chocolate pudding cup with 1 graham-cracker square crushed and sprinkled on top
6. Sliced Veggies
Cut them up and keep stored in the refrigerator so they are ready to go. Think carrots and beyond such as sweet peppers both green and red, broccoli, cauliflower, zucchini, snow peas, 
celery, cucumbers, fennel, and radishes.
7. Chips and Dip
2 tablespoons low-fat spicy bean dip and 18 baked tortilla chips
8. Oranges with Walnuts
4-ounce mandarin-orange cup topped with 2 tablespoons chopped walnuts
9. A cup of cherries
a cup of cherries = 65 calories, health benefits are contain vitamin C, A, high in antioxidants, melatonin which helps with sleep, helps protect against heart disease and certain cancers
10. small sized baked potato
80 calories potatoes are high in vitamin C, vitamin B6 as well as minerals potassium, magnesium, copper and a good source of dietary fibre which is essential for good stomach and bowel health
11. A tablespoon of dried fruits
These are low in fat and have a low glycemic index, which means they’re absorbed 
slowly from the stomach into the bloodstream and make you feel full longer. Dried fruits are also high in iron and fibre
12. Pumpkin or sunflower seeds
Just a handful of these provides essential omega three fatty acids that help maintain healthy cells and skin as well brain functionality.
13. A bowl of whole grain cereal, porridge, shredded wheat or muesli
These low-fat snacks are packed with fibre and minerals, which may be responsible for reducing the risk of cancer and heart disease
14. Half a bagel topped with a tablespoon of peanut butter
Bagels are low-fat and high in carbohydrates which means you’ll get an instant energy boost. And peanut butter is high in healthy unsaturated fats and contains iron, zinc, magnesium, iron, potassium and Vitamin E
15. A tablespoon of dried fruits
These are low in fat and have a low glycemic index, which means they’re absorbed slowly from the stomach into the bloodstream and make you feel full longer. Dried fruits are also high in iron and fibre.