I started an all veggie juice fast and have had tingling/numbness/itching in my hands and feet. What does this mean?

Pesticides? A short-term veggie juice fast is a great way to fast! You get loads of phytonutrients and enough calories so you are not miserable when you fast. You should know, however, that juicing can also concentrate pesticides used on the veggies. Some people react to the pesticides. If this is the case, you need to switch to organic veggies. Veggie allergies are also possible. Best wishes!
Possible vitamin. Deficiency caused by limited diet..you should go back to a natural and complete diet and see if symptoms improve.