Linking To And Embedding Dr. Nick Norwitz’s “Calories Don’t Cause Obesity… Yes, Really”

Posted on November 24, 2025 by Tom Wade MD

For more details on today’s topic, please see https://staycuriousmetabolism.substack.com/p/calories-dont-cause-obesity-really?r=40ekz2

Today, I review, link to, and embed Dr. Nick Norwitz‘s Calories Don’t Cause Obesity… Yes, Really.

All that follows is from the above resource.

Calories Don’t Cause Obesity… Yes, Really 

Nick Norwitz

Nov 24, 2025 #calorites #weightloss #metabolichealth
For references and a written breakdown, see the associated Stay Curious Metabolism Newsletter: https://staycuriousmetabolism.substac…
In this video, Dr. Nick Norwitz breaks down why calories don’t cause obesity, using data, metabolic physiology, and logic that will make you rethink how weight gain actually happens.
Through both human and mechanistic details, Nick shows how macronutrient distribution and food quality — not just calorie— drives fuel partitioning, hormone responses, and long-term fat gain. Two people can eat the same calories, yet one gains weight while the other doesn’t, because of how their bodies allocate.
Nick explains why calorie balance is a consequence, not a cause, how diets high in refined carbohydrates rewire energy partitioning, and why our obsession with calorie counting has distracted us from the real biology behind obesity, insulin resistance, and metabolic health.
If you’ve ever wondered why calorie counting fails, why obesity science is stuck, or what really determines fat gain, this video will change the way you think about metabolism.
Chapters:
0:00 – Calories Don’t Cause Obesity Explained
1:39 – How Calories and Fat Gain Uncouple
2:58 – What a “Fast Metabolism” Really Means
3:50 – Why Overfeeding Studies Mislead Us
4:52 – Human Trials: Calorie Balance Is a Consequence
5:35 – 5,800 Calorie Experiment: Low-Carb vs Low-Fat
7:50 – The Tweet That Broke the Internet
11:10 – Why We’re Obsessed with Calories
12:24 – What to Focus on Instead of Calories
14:44 – Did I Achieve My Goal? Reflections

 

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