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...

Grains, nuts and dried fruit all contain sugar so muesli will contain some sugar. The key is to not buy muesli with added sugar. Walmart and most of the grocery stores around me sell Bob's Red Mill muesli which doesn't have any added sugar. The grocery store I normally use also sells Alpen brand. I bought some Alpen No Sugar Added muesli there a couple of days ago because it was on sale.

Weird, not my experience. The Trader Joes version has no added sugars (see here https://traderjoesrants.com/2021/09/19/trader-joes-muesli-ce...) and the Whole Foods brand I see is Bob's Red Mill Muesli which also contains no added sugars (https://www.bobsredmill.com/old-country-style-muesli.html).