Katie Mehr

Hack Your Habits: The Secret Science of Motivation and Environment Design

What if building healthier habits wasn’t about more discipline — but about designing the right environment, social systems, and small daily actions that compound over time? In this episode of The Better Body Lab Podcast, we sit down with behavioral science expert Katie Mehr to explore the real science behind habit formation, motivation, and sustainable behavior change.

Together, we explore how science and lived experience intersect within the human ecology of behavior — where environment, mindset, social influence, and daily decisions shape long-term health, performance, and resilience. Katie shares research-backed insights on why willpower alone often fails, and how environmental design, social accountability, and structured goal setting can create lasting change.

Episode Overview

Together, we explore how science and lived experience intersect within the human ecology of metabolism, resilience, and performance. Dr. Kumar helps us unpack the shift from injectable to oral GLP-1 medications, the real-world challenges of medication access and off-label prescribing, and how emerging delivery technologies may reshape treatment pathways.

We also examine the deeper drivers of metabolic dysfunction — including hormonal changes, muscle loss, insulin resistance, and social stigma — while emphasizing the importance of individualized care. This conversation offers a grounded, science-informed perspective on weight management, hormone therapy in women, and the mindset shifts required for lasting health and longevity.

What You’ll Learn in This Episode‍ ‍

• Why environment often matters more than willpower in behavior change
• How to use temptation bundling to make habits more enjoyable
• The science behind SMART goals and why specificity drives success
• Pros and cons of public goal-setting and social accountability
• How to break large goals into small, achievable steps
• Why perfectionism undermines long-term progress
• The role of social influence and habit contagion
• How “fresh starts” can help — and why they often fail
• Practical strategies to build consistency through flexibility
• Why education + daily nudges improve habit adherence

About Our Guest

Katie Mehr is an Assistant Professor of Marketing at the University of Alberta, where she studies consumer behavior, motivation, and habit formation through lab and field experiments. She earned her PhD from The Wharton School at the University of Pennsylvania and focuses on how people set goals, build habits, and sustain behavior change.

Her research has been featured in outlets including The Wall Street Journal, The Washington Post, and CBC, and explores how environment, incentives, and social dynamics influence real-world decision-making.

For information about Katie Mehr visit: https://www.katie-mehr.com/

Take the Health Quiz here: https://healthdailyquiz.org/

Follow Katie Mehr here:
LinkedIn: https://www.linkedin.com/in/kmehr/
BSKY: https://bsky.app/profile/katiemehr.bsky.social
Google Scholar: https://scholar.google.ca/citations?user=J_jD-LYAAAAJ&hl=en

⏱ Episode Timestamps

00:00:00 — Biggest Behavior Change Question
00:00:27 — Personalization & Behavior Science
00:01:44 — Episode Intro & Guest Overview
00:02:44 — Marketing Meets Behavior Science
00:04:22 — Willpower vs. Environment
00:05:43 — Designing Your Environment
00:08:14 — Public Goals & Accountability
00:09:31 — Risks of Public Goal Setting
00:11:54 — Science of Public Accountability
00:13:16 — Social Media & Goal Stickiness
00:15:32 — When You Can’t Change Environment
00:16:47 — Temptation Bundling Explained
00:18:46 — Fresh Starts & Quitters Day
00:20:30 — Why Fresh Starts Fail
00:22:01 — Intrinsic vs. Extrinsic Motivation
00:24:30 — Flexibility & Getting Started
00:28:12 — SMART Goals Framework
00:30:21 — Micro Goals & Goal Chunking
00:33:20 — Goal Setting for Kids & Students
00:34:32 — Health Daily Quiz Overview
00:36:43 — Knowing vs. Doing Gap
00:39:39 — Social Learning & Copying Success
00:41:40 — Social Contagion of Habits
00:43:21 — Social Norms & Behavior
00:45:02 — Self-Sabotage & Self-Compassion
00:47:40 — Perfectionism vs. Flexibility
00:51:04 — Setting Multiple Goals
00:53:42 — Health Daily Quiz Research
00:56:06 — 30-Day Challenge Structure
00:57:09 — Personalizing Behavior Focus
01:00:34 — Myth of Willpower
01:02:16 — Habit Formation Myth
01:05:49 — Exercise & Individualization
01:10:01 — Key Takeaways & Closing