When Chocolate Changes Lives
How Chocolate Helps Cancer Patients Taste Again
For Belgian chocolatier Julius Persoone, the idea began with a simple question: what if food could help people experience something they had lost?
How It All Started
The collaboration began when Persoone was paired with Dr. Thomas Moore, a doctor specialising in patients with throat cancer. Together, they wanted to understand which flavours were most affected by chemotherapy.
They designed a simple flavour test. Before treatment, patients tasted a selection of ingredients, including chocolate, strawberry, mint, chilli and basil. After chemotherapy, they tasted the same ingredients again, this time blindfolded.
The results were striking: strawberry and mint were the two flavours patients found hardest to identify after treatment.
The team then discovered that chemotherapy can affect the body’s ability to produce saliva. Rather than simply accepting the loss of taste as a side effect, they began looking at saliva itself and developed a plant-based artificial saliva in the laboratory.
That became the foundation for their first chocolate.
A Chocolate Designed to Restore Taste
The idea was a praline containing a layer of artificial saliva, followed by strawberry and mint.
The chocolate shell required a different approach. At Persoone’s cocoa plantation, cocoa already undergoes alcoholic and lactic fermentation. The team introduced a third fermentation using sourdough yeast, creating a particularly acidic cacao for the outer shell.
The chocolate had one major limitation: because of the saliva enzymes, its shelf life was only a few days. It could not easily be manufactured and distributed on a large scale.
Instead, the project became a demonstration of what can happen when a chocolatier looks beyond the traditional boundaries of his profession and an inspiration for other chocolatiers and scientists to approach medical challenges differently.
From the Chocolate Lab to the Hospital
The experience led to a new collaboration with AZ Groeninge hospital in Kortrijk, where Persoone was given two new challenges.
The first involved patients undergoing swallowing examinations. During an X-ray, they traditionally receive contrast liquid on a piece of bread. The bitter, metallic taste made an already uncomfortable procedure even worse.
Before creating an alternative, Persoone underwent the examination himself to understand what patients experienced.
The solution was a chocolate praline. The team combined the contrast liquid with key limes from the plantation in Mexico and used an ultrasonic process to reduce the amount of contrast liquid needed. The shell was made with Koji-aged chocolate, whose strong umami qualities could help trigger the swallowing process.
Instead of swallowing unpleasant bread soaked in contrast liquid, patients could eat chocolate while achieving the same diagnostic result.
By the time of the interview, 50 patients had already undergone the examination using the chocolate. The praline was easier to administer, better received by patients and, according to the medical team, produced even better diagnostic results.
The Pleasure of Eating Again
The second project focused on patients who could only consume very light foods, often relying on liquid or tube feeding. Persoone asked a simple question: what if they could have chocolate, too?
The result was a hybrid praline designed to melt almost immediately in the mouth, recreating the sensation of eating real chocolate. With orange blossom and charm oil, it offered patients more than nutrition — flavour, texture and the pleasure of eating.
The response was deeply personal. Some patients hugged Persoone and told him the chocolate had changed their daily routine.
Where Chocolate and Medicine Meet
Persoone’s goal is not to revolutionise medicine, but to inspire people to think differently by bringing together medical knowledge with flavour, texture and the human experience of eating.
“If you combine those two worlds, you can create really magic things.”
For him, these projects are not about creating a business or a permanent line of medical chocolates, but about sharing ideas and knowledge that others can take further. And if chocolate can give someone back a moment of pleasure, comfort or even a taste they thought they had lost, that may be the most meaningful result of all.
