How Much Chocolate Would It Take To Literally Cause "Death By Chocolate"?

Death by chocolate

What makes chocolate deadly? You might be tempted, in this age of MAHA paranoia and FDA neutering, to blame it on additives or treatment processes – but in fact, chocolate comes out of the ground ready to kill. “Chocolate is derived from the roasted seeds of the plant Theobroma cacao,” explained pediatrician Fiona Finlay and veterinarian Simon Guiton back in 2005, “and the main toxic components are the methylxanthine alkaloids theobromine and caffeine.”

You’re probably already aware that caffeine is toxic in high enough quantities – it’s difficult to do via the normal ingestion route, because it takes about 70 cups of coffee to get a fatal dose, but plenty of people have accidentally killed themselves with caffeine powder. The reason is because it’s a stimulant, impacting the heart and central nervous system – too much in too short a time, and your heart just can’t cope.

Theobromine has similar effects, though it hits the body in different ways. It’s a more potent heart stimulant than caffeine – important, given that’s how they kill you – and it stays in the body longer. Caffeine, on the other hand, increases blood pressure – theobromine reduces it – but they both stimulate the gastrointestinal system, so overdosing can cause gnarly stomach problems like nausea and vomiting, cramps, pain, and the like. Oh – and they’re both really good at making you want to pee.

Overall, the two substances make for a hefty dose of poison if you eat enough chocolate – and it’s not a pleasant way to go. “One thing that is helpful, and I don’t know if helpful is the right word, but some of the initial symptoms are nausea and vomiting,” Reed Caldwell, an emergency medicine physician at New York University Langone Medical Center, told Popular Science back in 2021. From there, you might experience heart palpitations and weird tingling in your extremities; in extremely high quantities, it can trigger epileptic seizures, internal bleeding, and, yes, fatal overstimulation of the heart.

So here’s the question: why doesn’t every Easter bring a wave of mass heart attacks?

Surviving a lethal dose of chocolate

Humans have a few things going for us, evolutionarily speaking. We’re smart. We’re determined. We got big old dicks. And we’re really good at metabolizing theobromine and caffeine.

In fact, we’re very good at metabolizing and tolerating a lot of things, and the reason is simple: that big old liver sitting on top of our guts. It’s huge, and full of enzymes that can process all kinds of plant-based toxins – that’s why we can also tolerate alcohol so well compared to meat-dependent animals like cats and dogs.

When we eat chocolate, then, our livers can metabolize the caffeine into paraxanthine, which stimulates your nervous system but is less toxic than caffeine, and the theobromine into xanthine and methyluric acid, which are a stimulant and antioxidant respectively. Then, we just… pee them out.

To die by chocolate, we’d have to eat so much, so fast, that we overcome our bodies’ natural ability to process it. It’s very difficult – but it is possible. So how much does it take?

For that, you have to look at the LD50 level: the amount of a substance that it takes to kill 50 percent of a test population. As you might imagine, getting that number in humans can be, let’s say, ethically tricky – the number often quoted is 1,000 mg/kg of bodyweight, but that appears to be the figure for mice. While mice and rats, with their human-like willingness to eat almost anything, do indeed have unusually high tolerances for theobromine – potentially very close to our own – the 1,000 mg/kg figure appears to be a theoretical maximum for humans, rather than the result of any particular investigation.

In any case, 1,000 mg/kg of bodyweight is a big number. If the average adult in the US is about 84 kilograms (185 pounds), that means up to 84 grams, or 3 ounces, of theobromine should be ok. Now, the darker the chocolate, the more theobromine, with the highest amounts of all in unsweetened baking chocolate – but even in this rather bitter, unsavory form of the treat, it would take about 6.5 kilograms of the stuff to reach the limit. That’s more than 14 pounds in one sitting; it would be 39 cups of it in chip form, 8,300 Hershey’s kisses, or 50 of the biggest commercially available Cadbury’s Dairy Milk bars.

The caffeine is even less likely to kill you: with a lethal dose of this chemical being about 10 grams in humans, it would take more than 23 kilograms of chocolate to provide a fatal dose. By that point, we can practically guarantee, you are no longer ingesting that candy.

“Most of the time, if people have acute symptoms of caffeine toxicity, it starts with nausea and vomiting,” Jennifer Temple, an associate professor of exercise and nutrition sciences in the University at Buffalo School of Public Health and Health Professions, told Healthline in 2017. “So usually that’s sort of protective because you just get sick and you throw up the caffeine before it becomes too toxic.”

Stay safe out there

So, in total: yeah, you probably could die from too much chocolate – but it would be hard work. “There certainly is a toxic dose of chocolate, and it can be fatal,” Caldwell said. But if you’re eating that much chocolate in one go, you’ll run into other, rather painful issues first, and “the initial toxicity symptoms may help prevent people from consuming a lethal amount.”

But not all animals are so lucky. It’s worth repeating that humans – and mice and rats – are unusual for our chocolate tolerance, and most other animals – including your beloved dog, cat, rabbit, or even parrot – will die much quicker, from much lower doses of the delicious candy.

Overall, then, keep the chocolate treats for yourself. “For the otherwise healthy adult, without chronic medical problems like diabetes, most candy bars or boxes of chocolate that people receive for Valentine’s Day can be safely consumed today,” Caldwell told Popular Science.

“As long as your significant other doesn’t give you a 20-pound chocolate bunny, you’ll be okay.”