Try Lidl high protein rolls or Livlife bread both are low carbohydrate and therefore low sugar. Alternatively make your own using soy flour, gluten , yeast, a little sugar (it is used up by the yeast), salt, olive oil and water. You can add a variety of seed if you like. It is low carbohydrate and so low sugar. Tastes good and toasts well after some experimentation. I'm afraid you are on a voyage of discovery as far as foods are concerned.