Spinach helps control blood sugar levels in several ways. It is high in fiber which slows digestion and prevents blood sugar from spiking. As a non-starchy vegetable, it has little effect on blood glucose. Soluble fiber in spinach reduces blood sugar levels. It is also low on the glycemic index. Antioxidants in spinach like alpha lipoic acid lower blood sugar and increase insulin production. Spinach is beneficial for treating diabetic neuropathy. It also helps control blood pressure, which is often linked to diabetes. The potassium in spinach balances out sodium and prevents pressure increases.