Coconut sugar can be recommended for diabetics because it has the low GI (35) - not all palm sugars contain the same nutrients, nor do they all have the same GI. There is a lot of misinformation about coconut sugar and palm sugar - many use the terms interchangeably and apply the same nutritional values to both. 100 percent pure coconut sugar is the only reliable source for the nutrient claims. Palm sugar is used as a filler for coconut sugar and it adulterates the quality.
The PCA (Philippine Coconut Authority) has established guidelines for harvesting and processing coconut sap to ensure quality. The PCA now advises importers and manufacturers to only buy coconut sugar from accredited suppliers to ensure they are receiving pure coconut sugar. However, the only way for the consumer to be sure they are getting quality coconut sugar is to make sure the ingredients say: "100% pure coconut sap sugar" (it has to say that to be approved for export). Source info: PCA official government website