Coconut palm sugar is allowed yes - it has a lower glycemic index than other table sugars and is in its natural form. Palm sugar and palm oil are usually extracted from a different type of palm tree - the negative side of palm oil/sugar is that palm oil farmers are burning down rain forests and planting this particular type of palm tree in its place - so it is killing the rainforest and all the natural wildlife in it in order to sell more palm oil
This article will also help you to determine sweeteners that are better than the white sugar, http://danettemay.com/5-sweeteners-to-use-instead-of-sugar/.
If you really cannot resist eating brownies, you may want to check out a sweet but healthy recipe here, Flourless Brownies with Ganache Topping. Hope you enjoy this recipe.
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