Nutritional Quality of Edible Insects Protein

Abstract

World human population growth has increased the demand for sustainable protein sources, motivating interest in edible insects as a viable alternative to conventional protein from livestock. Insects offer significant environmental and nutritional advantages, requiring less land, water, and feed while emitting fewer greenhouse gases. Over 2000 species are consumed worldwide, with prominent examples including crickets, beetles, caterpillars, and ants. Their protein content is highly variable—ranging from approximately 3.9% to over 80% on a dryweight basis—depending on species, developmental stage, and analytical methods. Notably, many insects surpass the protein levels of beef and chicken. However, traditional nitrogen-to-protein conversion factors may overestimate the protein content due to chitin, underscoring the need for tailored methodologies. The amino acid profile of insects’ protein is rich in essential nutrients, with lysine, methionine, and tryptophan often exceeding the levels found in meat, supporting diverse physiological functions. Digestibility studies indicate that processed insect proteins approach 85–95% digestibility, comparable to casein and beef protein, though chitin can limit bioavailability if it is unprocessed. While cultural barriers and regulatory challenges persist, education, product innovation, and processing improvements can enhance their acceptance. Edible insects also present opportunities for bioactive peptides and functional food ingredients. Considering their nutritional value, low ecological footprint, and potential to strengthen food security, edible insects are positioned as a promising component of sustainable diets. Advancing research on processing methods, safety standards, and consumer engagement is essential to fully realize their role in addressing global nutritional and environmental challenges.