Is clinging the reason for losing interest towards certain things? We lose interest to certain things (foods, vehicles .. etc.) with time. Is clinging the reason for this ? Is this the nature of clinging ?

Are we able to maintain the interest level if we don't have clinging ? Does losing interest to do something (working on a project, studying, new year resolutions, etc.) means that I had the clinging to that thing (or end result) initially ?
We lose interest to certain things (foods, vehicles .. etc.) with time. Is clinging the reason for this ? Is this the nature of clinging ?


No, this is due to the impermanence of things (anicca).


  Are we able to maintain the interest level if we don't have clinging ? Does losing interest to do something (working on a project, studying, new year resolutions, etc.) means that I had the clinging to that thing (or end result) initially ?


It's the other way around. Interest in working, studying or new year resolutions are different forms of clinging, or grasping for that matter.

To clarify, the point here is not to be indifferent, but rather to foster equanimity.