This makes me think somewhat of my current reading...
The Ethics of Ambiguity, by Simone de Beauvoir. Although she's talking about our relationships with other people and the world, rather than our relationship with our future selves, there is significant overlap.
She talks about freedom in an existentialist sense. As her partner Sartre noted, we are all free, but freedom is terrifying, so we do all sorts of things to retreat or hide from it. She follows through on the implications of that freedom. One common interpretation of existentialist freedom is that we need only care about ourselves, not others (Nietzsche was a major proponent of this). She points out that this interpretation of freedom can lead to authoritarian, oppressive rule (she was writing in the immediate wake of WWII). So she argues that in order to exercise our freedom, we must use it to defend and exercise the freedom of others as well. To stand by when others are oppressed and lose their freedom (whether from external or internal cause) diminishes our own freedom, and puts our freedom at real risk. Our internal carelessness about the freedom of others leads directly to external risk to our own freedom.
It's a fascinating book. Extremely dense, but beautifully written and motivating. I find myself reading sentences again out loud, just to enjoy them.
I can see her argument easily extended to our relationship with our future selves - decisions we make with our freedom now can have negative impact on our future freedom. ie eat that cake now, still be fat tomorrow.