I would love expensive shoes that I know are just right for me but $$ is so tight right now, boyfriend has gone back to college and it leaves me with a large load to carry. I have an older pair of runners, maybe I will try those today and see if the same thing happens.
Trust me, its not a question, its a need! Your spine, your bones, your muscles all need support whilst you are thrashing the pavement. Its an already high impact regieme which has been shown even with trainers to speed up the aging process due to the impact and tugging on your facial skin, it affects your breasts if they have no support (check out the shock absorber website video) and trainers are a central part of making that worse. If they are not cushioned to some degree all this impact will cost you.
Your joints may also begin to show signs of wear and tear far faster (and even at all) in comparison to those that wear trainers which are supportive and have cushioning.
As you use your trainers they age, the air which puffs up the sole deflates. A key sign of this is creases in the sole of the show, there should be no creases. And then there is the need to wear shoes which are cushioning at all. None of these Converse trendy types, they will do very little to support you running and not reduce the impact.
And another value of reducing the impact is to reduce the changes of you getting numb feet. You slap your feet on the pavement too often, you stop the blood circulating properly, if the impact is to hard it simply cannot do this very well and the result? numb feet. If you can slow down a bit this can help but you have mentioned that your already walking which makes me think its the shoes and the impact that are not helping you rather then the speed of the impact.
Try also loosening your trainer laces, sounds simple but remember that your feet do swell when your working out and need more space inside your trainers. Too tight trainers can lead to numbness which once you have can be hard to get rid of unless you rest for a day, get your circulation back and go again the next day.