As another post cited, the sugar balances out the acidity of the lemons and oranges. (thecomfortofcooking.com)
The slight hint of sweetness is key for balancing out the acidity in the tomato puree. (thescrumptiouspumpkin.com)
It's also worth pointing out that these pancakes are made with whole wheat flour, which helps balance out any acidity from other ingredients. (verywellfit.com)