It's an evolution thing - both Darwinian, and spiritual, I'd wager.

Example: the immediate physiological reward from sugar - we just discovered and consumed an intense and highly available form of energy. Good.

But that used to require sticking one's hand into a beehive, or cutting a hole in a maple tree and waiting (etc.), and so we never evolved to process large sugar intake in a healthy way.

Yet it's readily available, everywhere, always. The animal brain wants more. That's natural.

The spiritual (call it what you will) evolution requires disintangling one's action from those desires (and fears), to instead move from a place of self/mindfulness/balance.

We're all still in school 🧘‍♂️