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The 14-year-old's digestive system cannot tolerate lipids - fatty compounds or oils which are found in foods - so he has them injected directly into his heart.

Some of these studies involved people with high blood lipids, people with high blood pressure, people who were overweight or obese, and some involved healthy people.

Such replacements have been found to improve cardiometabolic risk factors, including blood lipids and blood pressure as well as inflammatory biomarkers.

The amount and identity of natural lipids – fats and oils – found within a specific muscle tissue can influence the protein structure, and therefore the flavor, tenderness and juiciness, of the meat.

At the heart of these nanoparticles are ionizable lipids, special molecules that can switch between charged and neutral states depending on their surroundings.