The are several reasons your friend could be having numbness in her toes. One such problem is poor circulation. She could have diabetes as you mentioned which can be the cause of poor circulation. A lack of certain vitamins, specifically B vitamins can cause problems with the nervous system and circulation. Make sure she is getting proper nutrition loaded with fruits and vegetables too.

If your friend is sedentary, perhaps a lack or exercise is causing circulatory problems. Iron deficiency or anemia can be a culprit too. Before you really know what the cause is, she could try the B vitamins and exercise. If that doesn't help, perhaps she needs to see her doctor. He or she might wants tests to be run to see what the cause of the numbness is.

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There are any number of reasons why this can happen. One of the most common is simple lack of circulation. This is often caused by lack of exercise (get the blood moving to the extremities) and exacerbated by poor diet (consuming products that take a long time to process while contributing little to the needs of the body. These are also complications we often see in diabetics.

There are many reasons why toes may become numb, with or without a tingling sensation. The most common reason for this to occur is due to poor circulation and it is very common for long term heavy smokers to experience tingling in their foot area. Another common reason for this to occur can be related to a trapped nerve in the spinal area, usually caused by problems relating to poor posture, osteoarthritis, disc damage and other similar type back problems. As to possible reasons relating to diabetes, depending on the type of diabetes and individual has, there is a condition called diabetic foot. This condition usually relates to diabetes type 1 and can be quite common in the world of diabetes mellitus. Diabetic foot can occur with poor management of diabetes, enabling a long term effect from high blood glucose levels. Unfortunately this condition can lead to amputation in worse case scenarios but tingling in the feet would only be a reason to make an enquiry with a doctor. Although tingle can be felt with diabetic foot, ulcers or other wounds that appear on feet of a diabetic would be more of a concern. Otherwise just simple tingling may just be simple tingling.