Yes, the data feeds that you create are updated automatically so that when you send the product feed to merchant sites, you always send updated information.
Under Product Feed > Manage Feeds, you may select an interval at which the feed automatically refreshes: 5 minutes to 1 week.
Alternatively, you can manually update all feeds by clicking “Update Now” at the bottom of the page (please wait a few seconds before refreshing the page.
If you are having some issues keeping the product feed updated, you can contact us here.