Yeah, you should be careful when picking a brand, but I don't see muesli with loaded sugar at those places. Are you looking at granola? First off, I haven't seen them in my local stores (outside of Bob's Red Mill[1]). Walmart's website also mentions Familia Swiss Muesli Cereal, says "No added sugar" on the front and the nutritional values don't look far off. Trader Joe's also looks comperatble to Bob's Red Mill[2]

[1] https://www.bobsredmill.com/old-country-style-muesli.html

[2] https://www.whatsgoodattraderjoes.com/2021/01/trader-joes-mu...