Fiber

• Diets which include 50g or more of fiber a day can help lower blood sugar. The reason lies in the way fiber behaves in the digestive tract. Fiber reduces the rate of digestion, and fiber-rich foods take longer to break down. This means that the resulting sugars are absorbed slowly, which keeps overall blood sugar lower. Some foods which are high in fiber are beans and sweet potatoes. Whole-grain breads and cereals made with bran are also good fiber sources.
  
  

Nuts

• Nuts have a positive effect on blood sugar levels by lowering insulin resistance. Insulin is the hormone that directly affects the ability of cells to absorb sugar. Nuts provide fuel and contain properties which help the body use insulin. Nuts are rich in unsaturated fats, which are considered "good fats." They digest slowly, helping with blood sugar absorption. Recommended nuts include almonds, peanuts, walnuts, cashews and macadamia nuts.
  
  

Fruits

• Many fruits are known to help lower blood sugar levels. Lemons are on the list and are high in vitamin C, limonene and rutin, which help keep overall blood sugar levels low. Cherries, which contain antioxidants and high levels of soluble fiber, are known to help increase the amount of insulin created by the body. Avocados are actually considered a fruit and are known to raise insulin sensitivity, helping cells process blood sugars.
  
  

Spices

• Some spices are included on the list of blood sugar lowering foods. Cinnamon can be added to many other foods for flavor, and it has the added benefit of keeping blood sugar low. It contains natural compounds that act much like insulin and assist with blood sugar processing. Cinnamon has high levels of fiber and contains magnesium, a mineral also known for controlling blood sugar. Raw garlic is another helpful spice. It raises the production of insulin while increasing insulin sensitivity.
  
  

Other Foods

• Other food sources which lower blood sugar levels are onions, flaxseed, vinegar and black tea. Onions contain high levels of sulfur and flavonoid, which are antioxidants that act to reduce blood sugar. Flaxseed has both high fiber and healthy fat, which is known to reduce blood sugar levels. It also contains several other helpful minerals such as thiamin, magnesium, copper and phosphorus. Vinegar, when added to highly starchy meals, reduces blood sugar and lowers the spike of insulin that happens after such a meal. Studies by King's College, London, in 2007 found that black tea lowers blood sugar and also helps increase insulin levels.