Why We Eat (Too Much) audiobook cover - This gentle tour through evolution, hormones, and modern food culture helps explain why willpower often loses to biology—and how small, supportive changes in cooking, habits, and mindset can guide the body back toward steadier health.

Why We Eat (Too Much)

This gentle tour through evolution, hormones, and modern food culture helps explain why willpower often loses to biology—and how small, supportive changes in cooking, habits, and mindset can guide the body back toward steadier health.

Andrew Jenkinson

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Health & NutritionPsychologyPersonal Development

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Why We Eat (Too Much)
Evolution of Metabolism+
The Weight Control System+
Hormonal Messengers+
The Modern Food Environment+

Quiz — Test Your Understanding

Question 1 of 8
How did early single-celled organisms permanently solve their energy limitations billions of years ago?
  • A. By evolving the ability to photosynthesize sunlight directly into ATP.
  • B. By swallowing and forming a symbiotic relationship with oxygen-processing bacteria.
  • C. By developing complex multi-cellular structures that could digest carbon chains.
  • D. By mutating their DNA to survive in completely oxygen-free environments.
Question 2 of 8
According to the text, how did early humans biologically 'pay' for the massive energy demands of a larger brain?
  • A. By developing larger, more efficient lungs to process oxygen.
  • B. By increasing their overall body size and muscle mass.
  • C. By evolving a significantly shorter, less energy-intensive gastrointestinal tract.
  • D. By sleeping for longer periods to conserve daily energy expenditure.
Question 3 of 8
What was the primary biological benefit of discovering how to cook food with fire?
  • A. It 'predigested' food, breaking down molecular bonds and making nutrients easier to absorb.
  • B. It sterilized meat, preventing early humans from dying of bacterial infections.
  • C. It allowed early humans to preserve food for long winters.
  • D. It caused human teeth and jaws to grow larger and stronger to process charred meat.
Question 4 of 8
What did Ethan Sims' 1976 overfeeding experiment with prison inmates reveal about human metabolism?
  • A. Overeating causes the body to store 100 percent of excess calories as fat.
  • B. Overeating triggers the body to raise its metabolic rate to burn off excess energy.
  • C. Overeating permanently damages the hypothalamus, leading to chronic obesity.
  • D. Overeating shuts down the negative feedback system that controls hydration.
Question 5 of 8
Based on Ancel Keys' starvation study, why do traditional calorie-restriction diets usually result in rebound weight gain?
  • A. The body loses its ability to produce insulin when calories are severely restricted.
  • B. Calorie restriction permanently destroys fat cells, causing energy to be stored in organs.
  • C. The body interprets calorie restriction as a famine and dramatically lowers its metabolic rate to conserve energy.
  • D. Dieters inevitably binge-eat because calorie restriction stretches the stomach lining.
Question 6 of 8
What role does the hormone leptin play in the body's weight-control system?
  • A. It is released by fat cells to signal the brain to reduce appetite and increase metabolism.
  • B. It is produced by the kidneys to regulate water retention and thirst.
  • C. It is secreted by the stomach to signal when it is physically full of food.
  • D. It is produced by the pancreas to help cells absorb sugar from the bloodstream.
Question 7 of 8
How do the high levels of omega-6 fats found in modern processed vegetable oils contribute to the obesity epidemic?
  • A. They destroy the mitochondria in our cells, reducing our overall energy output.
  • B. They are converted directly into visceral fat much faster than saturated fats.
  • C. They dull the effectiveness of leptin, disrupting the body's natural weight-control signals.
  • D. They artificially increase the metabolic rate, leading to constant extreme hunger.
Question 8 of 8
What was an unintended consequence of 1980s government guidelines urging people to abandon saturated fats?
  • A. Manufacturers replaced fats with high amounts of sugar, leading to insulin spikes and intense cravings.
  • B. People began eating completely raw diets, which their shortened guts could not adequately digest.
  • C. The public shifted to eating exclusively red meat, ignoring the guidelines entirely.
  • D. The food industry stopped processing foods entirely, making them unaffordable for the general public.

Why We Eat (Too Much) — Full Chapter Overview

Why We Eat (Too Much) Summary & Overview

Many people live with the quiet frustration of wondering why weight feels so difficult to manage—especially when they’re trying hard. This narration explores weight and appetite from the inside out, beginning with how humans evolved to survive scarcity, and ending with how modern processing and diet culture can confuse the body’s safety systems.

Along the way, it introduces key hormones like leptin and ghrelin, explains why repeated dieting can backfire, and shows how industrial food trends changed what we eat and how we feel. The overall message is calm and empowering: the body isn’t broken or lazy—it’s protective. When people understand the signals, they can respond with patience, nourishment, and steadier routines.

Who Should Listen to Why We Eat (Too Much)?

  • Anyone tired of blame-based diet culture who wants a kinder, biology-informed view of weight and appetite.
  • Listeners who suspect their hunger and cravings are not “just willpower,” and want language for what’s really happening inside the body.
  • People looking for realistic, supportive habit changes—like cooking more simply, sleeping better, and reducing ultra-processed foods—without chasing perfection.

About the Author: Andrew Jenkinson

Dr. Andrew Jenkinson is widely known for explaining weight regulation through hormones, appetite signaling, and the body’s survival responses—emphasizing that long-term change is often less about discipline and more about working with human biology and a modern food environment.

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