We Asked 3,108 People How Fasting Changed Their Mood — 84% of Fasters Said Better

We Asked 3,108 People How Fasting Changed Their Mood — 84% of Fasters Said Better

We asked 3,108 people one simple question: "Mentally and emotionally, how do you feel with fasting and healthy eating?" Among those who actually fast, 84% said their mood got better. Only 5% said it got worse. That number doesn't come from a journal — it's our own poll of thousands of real experiences, and the full figures are on this page.

What the poll actually was

As always, the method first — because honesty about the method is what makes a number worth citing.

This was not a clinical study. It was an Instagram story poll of our audience, asking how fasting plus healthy eating had affected them mentally, with four options. In total, 3,108 people answered. The responses were self-reported, nobody was examined or tested — it's a snapshot of real people's experience, not a trial, and we publish it as exactly that.

The full numbers

One simple calculation reveals the headline number: 390 respondents don't fast at all. Among the 2,718 who do, 2,289 — 84% — said their mood improved. Only 128 (5%) said it got worse, and 301 (11%) felt no change.

What this shows — and what it doesn't

What it shows: for a decisive majority of people combining fasting with better food, the change wasn't just about the scale — it was a felt improvement in mood. A ratio of 84 to 5 — roughly seventeen people feeling better for every one feeling worse — is not a coin-flip pattern.

What it doesn't prove: this poll does not show that fasting treats depression or anxiety. Respondents chose to answer, people with good experiences are more likely to still be following us, and "feeling better" means something different to everyone. If you're dealing with serious depression or anxiety, fasting is not a substitute for treatment.

Why the result isn't scientifically surprising

Several known mechanisms sit behind that 84%:

• Stable blood sugar, stable mood. Blood-sugar spikes and crashes are a well-documented driver of irritability and mood swings. Fasting and dropping processed food flattens those waves.
• Neurotransmitters. Research shows fasting affects dopamine and serotonin — the brain's feel-good chemistry. We cover it in dopamine, serotonin and intermittent fasting.
• A sense of control. Part of the lift is psychological, not biochemical: after years of failed diets, finding an approach you can actually sustain feels like competence. We unpack it in does intermittent fasting improve mood?

Not every experience is positive — especially in the first weeks, hunger can genuinely make people irritable. If that's you, read can fasting cause anxiety and irritability? — it's usually temporary and fixable.

This is our second poll

A few days ago we asked 4,199 people what actually worked for them — 89% said fasting plus eating well, not diets. This poll adds the other half of the picture: the same combination doesn't just move the scale, it moves how people feel. This data belongs to our own audience and exists nowhere else on the internet.

For the complete guide

For the complete, step-by-step system, get Intermittent Fasting in Practice on Amazon — and claim 3 months free access to our fasting app at fastinginpractice.com/redeem.

FAQ

Where was this poll run?

On our Instagram story, asking "Mentally, how do I feel with fasting and healthy food…" with four options: better, worse, no difference, I don't fast. 3,108 people voted.

Does fasting really improve mood?

84% of the fasters in this poll say it did for them, and known mechanisms back it up — from stabilized blood sugar to effects on dopamine and serotonin. But every body responds differently, and this is a poll, not a clinical study.

Why do some people feel worse when fasting?

Usually one of three reasons: starting too aggressively, not eating enough nutritious food in the eating window, or a schedule that doesn't fit the body's current state (for women, often the week before their period). The 5% shows the experience is real but rare — and almost always fixable.

I have depression — should I fast?

Fasting is not a treatment for depression. If you're in treatment, talk to your doctor before starting — especially if you take medication, since meal timing can affect it.