All foods are comprised of a complex mixture of different nutrients. These can be categorised as below, and while all of these are essential, they must be kept in the correct balance to obtain optimal health.
Protein
Protein is fundamental for structural growth, tissue repair, and overall maintenance of the body. In gibbons, dietary protein provides the essential amino acids necessary to build and sustain the dense shoulder, arm, and torso musculature required for brachiation, their primary, highly energy-intensive form of locomotion. Additionally, protein plays a critical physiological role in supporting enzymatic and immune functions, and it is exceptionally vital for females during gestation and lactation to ensure the development of the offspring and milk synthesis.
Fat
Dietary fats, or lipids, serve as concentrated energy source and are foundational for cellular membrane integrity and hormone production. Crucially, fat is required for the proper absorption, storage, and transport of fat-soluble vitamins throughout the gibbon’s body. While fats make up a smaller proportion of their natural dietary intake, those derived from lipid-rich wild fruits or opportunistic insect consumption are vital for neurological function, maintaining healthy skin and hair, and providing energy during environmental fluctuations.
Carbohydrates
Carbohydrates are a complex group of nutrients, which can be grouped into fibres (eg. hemicellulose, cellulose, lignin), starches and simple sugars.
Fibre
Fiber is a complex structural carbohydrate that regulates the health, volume, and motility of the gibbon gastrointestinal tract. Complex dietary fibers, such as the cellulose and hemicellulose found in leaves, stems, and bark, resist immediate digestion in the stomach. Instead, they travel to the lower gut, where they are broken down and fermented by a highly adapted, symbiotic bacterial microbiome. This microbial fermentation not only prevents gastrointestinal stasis but also yields volatile fatty acids, which serve as an important, slow-releasing secondary energy source when preferred fruits are unavailable.
Starch
Starches are longer chains of simple sugars, which break down easier than fibres. They are commonly found in many plant parts, for example tubers like potato or cassava. Gibbons don’t normally descend to the forest floor where many of these parts could be found, but they still consume small amounts of starch in their wild diet. Starch is also frequently present in captive diets.
Sugar
Simple sugars function as the primary, most immediate energy source for gibbons. Because gibbons maintain a highly active, arboreal lifestyle with elevated metabolic rates, they rely heavily on the rapid digestion and absorption of simple carbohydrates, which they naturally extract from the pulp of ripe, fleshy fruits. This quick assimilation of simple sugars into the bloodstream provides the rapid, easily accessible energy required to power the intense muscular bursts and sustained aerobic effort needed to travel through the high forest canopy. However, too much simple sugar is linked to obesity and diseases like diabetes.