“I Know What I Need to Do… But Doing It Is the Hard Part”
A Health Psychologist’s Perspective on Why Knowing Isn’t the Same as Changing

If you’ve ever found yourself saying, “I know exactly what I should be doing… so why am I not doing it?” You are in good company. In my clinical work across the NHS and private practice, this is one of the most common frustrations people bring to therapy and health behaviour coaching.
And I want to reassure you of something:
This isn’t laziness. This isn’t lack of discipline. This is psychology.
Understanding why this happens is the key to shifting it.
Why Knowing Isn’t Enough: The Psychology Behind the Gap
Health psychology research consistently shows that information alone does not create behaviour change.
Here are the core reasons why:
1. The Intention–Behaviour Gap (Theory of Planned Behaviour)
Even with strong intentions, follow-through gets blocked by:
- Low perceived control (“My day got derailed… again.”)
- Beliefs like “It has to be perfect or it’s pointless.”
- Real-life barriers: workload, caring responsibilities, limited energy.
2. Habit Loops Override Good Intentions
Many health behaviours such as snacking, skipping meals, collapsing on the sofa after work happen on autopilot.
Habits form because they are:
- Automatic
- Stress-relieving
- Easy
- Safe
- Familiar
Your brain will always choose the path of least resistance unless you deliberately reshape the environment and routines.
3. Motivation Needs More Than Willpower (Self-Determination Theory)
True, sustainable motivation is built on:
- Autonomy: feeling like the change is your choice
- Competence: feeling capable
- Connection: feeling supported
Without these, change feels like a grind.
4. The Stress–Nervous System Cycle
When stress is high, the body enters survival mode and survival mode prioritises getting through the day, not building new habits.
This is why emotional eating, procrastination, sleep struggles, and “I’ll start tomorrow” are more common when life feels overwhelming.
What Actually Helps? Small, Psychological Shifts That Build Big Change
1. Replace all-or-nothing with “something is better than nothing.”
Perfection closes people down, consistency grows from small, repeatable actions.
2. Make the environment do the heavy lifting.
Visible cues, simple prep, and fewer steps between you and the behaviour dramatically increase follow-through.
3. Make habits tiny and impossible to fail.
If it’s too big, your brain will resist.
If it’s small, it becomes doable even on difficult days.
4. Regulate your stress response first.
A calm nervous system supports good choices; an overwhelmed one defaults to old patterns.
5. Practice compassion, not criticism.
Shame shuts people down.
Encouragement helps them try again.
The Truth Is… You Don’t Need More Information
You likely already know what you “should” be doing.
The real transformation comes from learning how to support your mind and nervous system so those intentions become actions, consistently, gently, and sustainably.
Top 5 Practical Tips to Start Closing the Gap Today
- Choose one tiny behaviour and make it ridiculously small.
For example: 2 minutes of stretching, 1 glass of water in the morning, 3-minute walk. - Create a “When–then” plan.
When I finish lunch, then I will go for a 5-minute walk.
This reduces decision-making pressure. - Remove barriers, even silly ones.
Put trainers by the door, prep the fruit bowl, lay out vitamins, keep water in sight. - Use a daily “reset moment.”
Midday or evening pause: What’s one helpful thing I can still do today? - Check in with your stress levels before forcing change.
Try 60 seconds of slow breathing or grounding.
A calmer body makes better choices.
Ready to Turn ‘I Know What to Do’ Into ‘I’m Finally Doing It’?
If you’re stuck in the cycle of good intentions but inconsistent action, you’re not alone and you don’t need to figure this out on your own. This is exactly what psychological, nervous-system–informed behaviour change work is designed to help with.
👉 If you’d like support with understanding your patterns, building healthier habits, or improving your relationship with food and health now or in 2026, you can book a free 15-minute discovery call via info@evokinghealth.co.uk or join my socials for more on this topic.
Small steps. Gentle changes. Real progress.
You can do this!
If this blog resonated with you, you’ll love my monthly newsletter where I share more tools to help you stay consistent, even on busy days. Sign up here: www.evokinghealth.co.uk
If you’d like to connect, you can reach me at: info@evokinghealth.co.uk
Best wishes,
Dr Neesha Patel
Chartered Health Psychologist & Founder of Evoking Health Ltd.









