Most of us already know what we should be doing to take better care of our health.

Sleep more.
Move more.
Eat more vegetables.
Manage stress more effectively.

Yet knowing what to do doesn't always translate into action.

Why is it often so difficult to follow through on behaviours we know are good for us?

Behavioural science offers an interesting answer.

Why knowledge isn't the problem

We have never had more access to health information.
Books. Podcasts. Apps. Wearables. Social media.

Every day, we are exposed to advice about nutrition, exercise, sleep and stress management.

Yet many of the behaviours that support long-term health remain surprisingly difficult to sustain.

The challenge is no longer access to information.
The challenge is turning information into habits that last.

The intention–action gap

Researchers often refer to the "intention–action gap" to describe the distance between what we plan to do and what we actually do.

We intend to cook a healthy meal.
Then we order takeout.

We plan to go for a run.
Then we postpone it until tomorrow.

We decide to go to bed earlier.
Then we watch one more episode.

A landmark review by psychologists Peter Sheeran and Thomas Webb found that while intentions are important predictors of behaviour, many never translate into action.

In other words, wanting to change is not always enough to create change.

Why motivation doesn't explain everything

When we struggle to maintain healthy habits, we often assume we lack motivation.

But motivation is only part of the equation.

Our environment, existing habits, mental bandwidth, daily constraints and the ease of a behaviour all play a significant role.

Behavioural science shows that our actions depend not only on what we want to do, but also on how easy those actions are to perform.

The question is not simply: "Am I motivated enough?"

It is also: "Have I made this easy enough to do?"

The hidden role of friction

Behavioural scientists use the term friction to describe anything that makes a behaviour harder to perform.

Every additional step requires effort.

Thinking. Deciding. Planning. Organising.

The more effort a behaviour requires, the more likely we are to postpone it.

According to BJ Fogg's Behaviour Model, behaviours are more likely to occur when they are both desirable and easy to perform.

Even strong motivation can fade when an action feels too complicated.

Reducing friction, on the other hand, increases the likelihood that a behaviour will be repeated.

Habits depend more on systems than willpower

We often think healthy living is the result of making good decisions over and over again. The reality is more nuanced.

Research by psychologist Wendy Wood suggests that much of our daily behaviour is driven by habits rather than conscious decision-making.

Over time, behaviours become associated with specific cues: a time of day, a place, a routine or a visual reminder.

As a result, they require less mental effort.

Consistency is therefore less about maintaining high levels of motivation and more about creating systems that continue to work even when motivation fluctuates.

When more choice becomes an obstacle

In a well-known experiment, researchers Sheena Iyengar and Mark Lepper compared two jam tasting displays.

One offered 24 varieties. The other offered just 6.

The larger display attracted more attention. The smaller display generated more purchases.

While later research has nuanced these findings, the principle remains relevant: more options do not always lead to better decisions.

The same can apply to health.

More data.
More recommendations.
More products.
More decisions.

Sometimes, more choice simply makes action harder.

How to reduce friction in everyday life

A few simple adjustments can make healthy behaviours easier to maintain:

• Prepare your workout clothes the night before.

• Schedule exercise sessions in your calendar.

• Keep nutritious foods visible and easily accessible.

• Automate recurring decisions whenever possible.

• Simplify your routine.

The goal is not necessarily to do more. Often, it is to make the right behaviours easier to repeat.

Key takeaway

Motivation matters, but it fluctuates.
Habits endure.

Long-term health is rarely built through occasional bursts of willpower. It is built through simple actions repeated consistently over time.