There is nothing wrong with a trail mix, except that it’s a very energy dense snack. Most trail mixes contain dried fruits and an assorted mix of nuts. They are perfect when you are doing activities that require you to use a lot of energy like hiking or intense workouts. But eating trail mix as a snack when all you do all day is sit behind a desk will not help you lose weight. Trail mixes contain a lot of carbs and fat, the perfect recipe for adding weight. But if you can control your portions, you should be fine.