TL;DR
- Discipline isn't a fixed character trait. Research suggests it fluctuates based on context, and certain conditions work against it before you've even started.
- Loneliness is one of those conditions. It triggers a threat state in the brain that impairs willpower and perseverance.
- The relationship runs both ways: isolation makes goals harder, and repeated private failure can deepen isolation through shame.
- The fix isn't more effort alone. Social connection restores the capacity to follow through.
- Shared challenges go further than simple accountability. Daily contact around a common goal creates shared purpose, which can forge genuine connection faster than almost anything else in adult life.
You've tackled challenges before: quit smoking, lose weight, write every day, spend less time on your phone.
You were serious about it. You had a plan, maybe even wrote it down. The first few days went fine. Then life happened, motivation dipped, and without anything to catch you, you quietly stopped. No announcement. No failure moment. Just a gradual fade.
You probably blamed discipline.
That's the natural conclusion. You wanted it, you just didn't follow through, so something must be wrong with your willpower. But there's an often overlooked variable: whether you were doing it alone.
Discipline Is Not a Character Trait
When researchers talk about self-regulation, they mean something close to what most of us call discipline: the capacity to do the thing you intended to do, even when you don't feel like it. Override the impulse to skip the workout. Sit down and write when you'd rather scroll. Choose the salad.
Research suggests that discipline isn't a fixed character trait. It fluctuates based on context, and certain conditions quietly work against it before you've even started.
The current thinking is less about running out of willpower like a battery, and more about how the brain allocates effort. According to the Expected Value of Control theory, the brain continuously evaluates how worthwhile and achievable a goal seems, then adjusts how much mental effort to invest accordingly. (4) Under certain conditions, that calculation quietly shifts against you.
Loneliness is one of the conditions that shifts that calculation against you.
What Loneliness Does to Your Brain
Loneliness isn't just an emotion. It's a threat state.
When you feel socially isolated, your brain shifts into a kind of low-grade vigilance mode, scanning for danger, bracing for rejection. This isn't irrational, it's evolutionary. For most of human history, being cut off from your group was genuinely dangerous.
The problem is that this vigilance is metabolically expensive. It consumes cognitive and emotional resources that you'd otherwise spend on things like, say, following through on your goals.
Research published in a comprehensive review of loneliness consequences found that this implicit hypervigilance directly works against self-regulation capacity, the mental resource that discipline draws from. (1)
In other words: loneliness quietly shifts the brain's priorities away from your goals, often before you've even tried to pursue them.
The Loop
Here's where it gets more interesting, and a little uncomfortable.
The relationship between loneliness and self-regulation doesn't just run one way. Research by Stavrova and Kokkoris found that low self-control is itself a hidden cause of loneliness, because poor self-regulation tends to produce behaviors that strain or erode social relationships over time, things like not showing up, not following through, reacting poorly, which can lead to social ostracism. (2)
So you have a loop. Loneliness shifts the brain's effort calculation against your goals. And when following through becomes harder, so does maintaining the social contact that would reduce the loneliness in the first place.
Now here's the part that isn't established research but feels worth sitting with: what happens to someone who keeps failing at goals alone?
The failure itself is usually a private experience. There's no one to process it with, no shared context, no one who noticed. And repeated failure, even in private, produces its own kind of shame, because private failure becomes something to hide, and hiding something can make genuine connection harder.
That's not a proven causal chain, but it seems like a reasonable interpretation.
Why the Solution Is Probably Not What You Think
The obvious response to repeated goal failure is to try harder. Better system. Stricter schedule. More motivation.
But if the underlying issue is that isolation shifts your brain's effort calculation against the very goal you're trying harder at, more effort alone won't fix it. You're pouring water into a bucket with a hole in it.
The research points in a different direction. Cacioppo's work found that loneliness impairs willpower and perseverance across the board, and that social connection works in the opposite direction, restoring the capacity to follow through. (3) Even the perception of social connection appears to recalibrate how the brain prioritizes effort.
Accountability, then, isn't just a productivity hack. It's addressing the root condition.
But There's Something Even Better Than Accountability
Accountability addresses the isolation problem. But there's a version of this that goes further, and it's easier to show than explain.
My neighbor and I would get together with our wives every couple of months. Friendly, but surface level.
Then we did a 30-day plank challenge together.
My plank went from just over a minute to 3:20. But that wasn't the real result.
Every day or two, we were texting. Complaining about how hard it was. Chiding each other for missing. Squeaking it in under the wire at 11pm. Small moments, but they added up.
30 days of that and we weren't acquaintances anymore.
What happened wasn't really about the plank. The daily contact, purposeful and low-stakes, did something that years of occasional dinners hadn't. It created shared purpose. We had something to talk about, something to complain about together, something to quietly push each other through.
That shared purpose is qualitatively different from just having a witness. An accountability partner watches you. A shared challenge puts you both in the same experience, with the same stakes, on the same timeline.
The Structures That Already Exist
This isn't a new idea. Humans have always built connection through shared experience.
Sports teams. Military units. The reason these create such durable bonds isn't just proximity or time, it's that people go through something together, and the relationship is forged in that process. Softer versions exist too: book clubs, run clubs, recreational leagues. They work on the same principle.
The problem is that most of these structures come with real friction for someone simply trying to build a habit. Fixed schedules, specific locations, social awkwardness of joining mid-stream, and an ongoing open-ended commitment with no clear exit point.
There's no natural finish line, and that matters more than it sounds. As we explored in a previous article in this series, motivation tends to accelerate as a deadline approaches. Open-ended commitments don't have that built-in momentum, which makes it easier to quietly drift away when life gets busy.
A Faster On-Ramp
Time-boxed challenges are a lighter, more repeatable version of the same mechanism. A defined commitment, a shared experience, daily contact, a finish line you cross together. The intensity is compressed into weeks rather than years, which is why the effect on relationships can feel surprisingly fast.
It's worth being honest: this doesn't work with just anyone. Chemistry between people still matters. But the structure creates conditions that almost nothing else in adult life does, especially for people who are past the natural relationship-building environments of school and early careers.
Don't Tackle Your Next Goal Alone
If you've tried and failed at the same goal more than once, the instinct is to look for a better plan or more motivation.
It might be worth asking a different question: who else could be doing this with you?
Not because you need someone to hold you accountable in some formal sense. But because the research suggests that doing hard things alone is harder than it needs to be, and that the act of doing them together might address something you didn't know was missing.
The goal, it turns out, might be the pretext. The daily contact and social connection is what does the real work, and can help address the loneliness that was making the goal harder in the first place.
My Pacts is a social accountability app for time-boxed group challenges with real friends. If this resonated, you can try it at mypacts.com.
References
- Hawkley, L. C., & Cacioppo, J. T. (2010). Loneliness matters: A theoretical and empirical review of consequences and mechanisms. Annals of Behavioral Medicine, 40(2), 218–227. https://pmc.ncbi.nlm.nih.gov/articles/PMC3874845/
- Stavrova, O., & Kokkoris, M. D. (2019). Low self-control: A hidden cause of loneliness? Personality and Social Psychology Bulletin, 45(1), 46–62.
- Cacioppo, J. T., & Patrick, W. (2008). Loneliness: Human nature and the need for social connection. W. W. Norton & Company.
- Frömer, R., Lin, H., Dean Wolf, C. K., Inzlicht, M., & Shenhav, A. (2021). Expectations of reward and efficacy guide cognitive control allocation. Nature Communications, 12, 1030. https://pmc.ncbi.nlm.nih.gov/articles/PMC7884731/