Sweet Success: The Link Between Chocolate and Nobel Prizes

If you want to win a Nobel Prize, forget about studying physics or practicing literature. You might want to just start eating more Swiss chocolates.

In one of the most famous (and delicious) examples of scientific data visualization, Dr. Franz Messerli published a study in the prestigious New England Journal of Medicine that found a direct linear relationship between a country’s annual chocolate consumption and the number of Nobel Prizes it has won per capita.

The study, titled “Chocolate Consumption, Cognitive Function, and Nobel Laureates,” began as a whimsical thought experiment but ended up producing a correlation so strong (r = 0.791) that it would make most clinical drug trials jealous.

The Data: A Perfect Line?

Messerli plotted the chocolate consumption (kg/year/capita) of 23 countries against their number of Nobel Laureates per 10 million people. The resulting graph showed a shockingly straight line moving up and to the right.

The Findings

• The Leader: Switzerland was the undisputed champion, consuming the most chocolate (nearly 12kg per person per year) and boasting the highest number of Nobel laureates.
• The Middle Pack: Countries like Denmark, Austria, and Norway fell right in the middle, consuming moderate amounts of chocolate and winning a moderate number of prizes.
• The Bottom: China consumed the least chocolate and had the fewest laureates (per capita).
• The Outlier: Sweden was the only major anomaly. It had far more Nobel laureates (32) than its chocolate consumption (6.4 kg) would predict. Messerli jokingly suggested this was either a case of “patriotic bias” (since the Nobel Committee is based in Stockholm) or that Swedes are extremely sensitive to chocolate, needing only small doses to boost their cognitive power.

The Science: Can Chocolate Make You Smarter?

Why on earth would candy make a nation smarter? While the study was tongue-in-cheek, there is actually a biological mechanism that makes it plausible.

The theory points to Flavonoids (specifically flavanols), a potent class of antioxidants found in cocoa beans.

How Flavonoids Affect the Brain

1. Blood Flow: Research has shown that cocoa flavanols can improve endothelial function, increasing cerebral blood flow. A brain with better blood flow gets more oxygen and glucose, theoretically improving performance.
2. Neuroprotection: High-dose flavanols have been linked to improved cognitive performance in elderly patients, slowing the decline of memory.
3. Mood Elevation: Chocolate contains compounds that stimulate the release of endorphins and dopamine, potentially aiding the “creative flow” state necessary for breakthrough discoveries.

4. The Glucose Engine

The brain is a greedy organ. Despite accounting for only 2% of body weight, it consumes 20% of the body’s energy (glucose). High-intensity cognitive work—like solving physics equations or writing a novel—burns glucose rapidly. This creates a physiological craving for sugar. It is possible that Nobel Laureates consume more chocolate not because it gives them brain power, but because their high-functioning brains demand it as fuel. They are simply refueling the engine.

The Reality Check: Correlation vs. Causation

Before you rush to the store to replace your vegetables with Toblerone, we must address the elephant in the statistical room.

This study is the textbook definition of “Correlation does not imply Causation.”

Just because two variables move together doesn’t mean one causes the other. In this case, there is likely a third, hidden variable (a confounder) that causes both.

The Hidden Variable: Wealth (GDP)

The most likely explanation is national wealth (GDP per capita).

• Chocolate is a luxury: Wealthy nations can afford to import and consume large amounts of high-quality chocolate.
• Science is a luxury: Wealthy nations can afford to fund expensive research universities, laboratories, and grants that lead to Nobel Prizes.

Therefore, Switzerland isn’t smart because it eats chocolate. It is rich, so it can afford both lots of chocolate and lots of physics labs.

Other Spurious Correlations

The “Chocolate-Nobel” link belongs to a hall of fame of funny “spurious correlations” that statisticians use to teach students to be careful:

• Ice Cream and Drowning: Sales of ice cream correlate almost perfectly with drowning deaths. (Reason: Both happen in Summer).
• Pirates and Global Warming: The decline of pirates since the 1800s correlates with the rise in global temperatures. (Reason: Industrialization caused both pirates to vanish and CO2 to rise).
• Nicholas Cage and Pool Falls: The number of films Nicholas Cage appears in per year correlates with the number of people who drown by falling into a pool. (Reason: Pure coincidence).

The Caveat: Quality Matters

Before this article becomes an excuse to binge on cheap candy bars, a distinction must be made. The benefits come from cocoa solids (flavanols), not sugar.

• Dark Chocolate (>70%): High in flavanols, lower in sugar. Good for the brain.
• Milk Chocolate: Mostly sugar and milk powder. The “sugar crash” that follows a spike in blood glucose creates brain fog, which is the opposite of what you want.

If you want the “Nobel Effect,” you need to develop a taste for the bitter, complex flavor of high-quality dark chocolate.

Despite the statistical flaws, Dr. Messerli concluded his paper with a pragmatic piece of advice. He noted that while the correlation might not be causal, the cognitive benefits of cocoa are real enough that he personally consumes dark chocolate every day.

And frankly, in a world of difficult health advice (run 10 miles, eat kale, sleep 9 hours), “eat more chocolate to get a Nobel Prize” is the kind of science we can all get behind.