Most 'healthy' snack bars (granola bars, protein bars, energy bars) are candy bars with marketing — high sugar, low protein, lots of fillers. The health framing doesn't survive a careful ingredient list. The few exceptions are worth knowing; most aren't.
What to look for
Protein content over 10g (genuine protein bar). Sugar content under 8g. Short ingredient list with recognisable items. Bonus: high fibre (5g+).
What's mostly misleading
'Made with whole grains' (often a small amount). 'Natural ingredients' (sugar is natural). 'No added sugar' (often uses concentrates that are functionally sugar). 'Plant-based protein' (often pea protein in tiny amounts).
Better snack options
Greek yoghurt + nuts. Hard-boiled egg + carrot sticks. Cottage cheese + berries. Apple + almond butter. Beef jerky + cheese cube. Hummus + veg.
Check the label rather than trusting the front-of-pack marketing. Most 'healthy' bars don't pass scrutiny.