Probably.
Often the main ingredients in processed foods were bred, managed, and harvested entirely with production and shipping in mind, and have very little flavor. Manufacturers add a lot of salt and sugar so they’ll taste like something; and probably also because those are both preservatives; and possibly in some cases because they’re cheaper than the supposed* main ingredients. People get accustomed to large amounts of salt and sugar, so that’s what tastes right to them.
IMO, sweet potatoes don’t need any added sugar unless you’re making a dessert with them, and then they don’t need very much.
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- a lot of ingredient labels, which are legally required at least in the US to be in order of amount in the product, read like this: 1) Supposed Main Ingredient. 2) Sugar source. 3) additional food ingredient, maybe. 4) another sugar source 5) another sugar source 6) spice or maybe another food ingredient 7) another sugar source . . .
If you add up all the sugar sources, I suspect they’d often have to be listed as ingredient 1.