Actually, I believe there is a negative impact. I have read that sugar suppresses your immune system by as much as 50%. Also, you could be putting yourself at risk for thrush while breastfeeding. Thrush is basically a yeast infection and sugar will totally feed a yeast infection of any type. Also, if you are trying to lose weight, sugar will not help you with that at all. It makes your blood sugar spike and crash and you want your levels to remain steady so that your metabolism can function properly. If you have a sweet tooth, try and find things with honey or agave syrup or maple syrup as the sweetener. These are better than cane sugar. Also, if you like stevia (I don't like it), but this is a great way to sweeten stuff and stevia technically is an herb and doesn't raise blood sugar at all. Another thing to remember about sugar is that you need fat to balance out the sugar. for example, eating icecream that is REAL and has real cream in it is actually better for your glycemic levels. The fat in the icecream helps to balance out the sugar and keeps your blood sugar more stable. My friend had gestational diabetes and her doctor told her if she wanted icecream, to eat one with the most fat in it. This helps to balance the sugars. This concept works well on other things too. If you have a piece of bread, put butter on it to balance out the sugars in the bread. I know it seems counter-intuitive, but sugar makes you fat, not fat (as long as it's good, healthy, REAL fat). I eat real butter, cook w/ coconut oil, use heavy cream in my coffee and I have lost 50 pounds in this last year without even trying. I basically cut out sugar and anything that turns into sugar (bread, rice, pasta, potatoes, etc). I actually don't eat any grains and this has been the best weight loss plan ever. I also have had my cholesterol levels checked after eating this way for a couple of years and my cholesterol was really good. I know reducing sugar intake is super hard but you almost have to think about it like a drug. It takes about a 5-7 days to get through sugar withdrawls and then after that, you really don't crave it at all anymore. My husband and I both experienced this first hand and it is truly amazing and we both feel so much better.