Sacrificing a present subject's welfare for a past self's preferences treats the current person as a mere instrument, violating the Kantian constraint against using persons solely as means.

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Immanuel Kant(as the originator of this concept): An 18th-century German philosopher who developed major ideas about ethics, reasoning, and how we understand the world; he's famous for arguing that morality is based on universal rules that apply to everyone equally.
Instrument(ethics): A tool or means to achieve some other goal, rather than being valuable or good in itself.
Kantian constraint(as used in ethics, referring to Kant's moral philosophy): A rule or principle based on Immanuel Kant's philosophy that says you should never treat people as tools to achieve your goals—they deserve respect as individuals with their own purposes.
using persons solely as means(as used in ethics): Treating someone only as a tool to get what you want, without respecting them as a person with their own goals and dignity.

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