The basic habit loop
Habits form through a cycle of cue, routine, and reward — a trigger prompts a behavior, which produces some kind of reward, reinforcing the connection between cue and behavior over repetition.
Why willpower alone is an unreliable habit-building strategy
Willpower is a genuinely limited, fluctuating resource, affected by stress, sleep, and general mental fatigue — building habits through environmental design and consistent cues tends to be more reliable than depending on willpower alone.
The mental health connection
Established healthy habits reduce the ongoing decision-making and willpower burden of daily life, which can genuinely support better mental health by reducing decision fatigue and the psychological cost of constantly having to choose healthy behaviors from scratch.
Practical ways to build habits that actually stick
Attaching a new habit to an existing routine, starting smaller than feels necessary, and being patient with the genuinely gradual process of habit formation (often taking months, not weeks) all support more durable habit change.