In recent years, food technologists and health scientists have been genuinely concerned about the safety of both the environment and food. Rapid, sensitive, and highly specific detection of various food and beverage constituents, as well as infections, toxins, and pesticide residues in food and water, is urgently needed. Biosensors perform significantly better than any other diagnostic tool now on the market in terms of selectivity, sensitivity, stability, repeatability and low cost. They have discovered potential uses in the food and agricultural industries, as well as in industrial processing and monitoring, environmental pollution control, and other fields. The goal of employing a biosensor is to improve detection specificity, decrease analysis time, apply on a wide scale, and use with less resource consumption than molecular approaches. In today's technological age, where everything is automated, the food business has a critical need for cutting-edge safety technology. To assure safety precautions, numerous biosensors have already been created and are now being developed. Both microbial biosensors based on Alcohol dehydrogenase and biosensors based on immobilised Candida tropicalis or Saccharomyces ellipsoids cells have been created for ethanol readings. A Cu nano-cluster with peroxidase-like activity was used to make a calorimetric sensor for the detection of xanthine, and gold nanorods were used to make a multicolor sensor for the detection of hypoxanthine. A biological sensor based on Pseudomonas fluorescens and an oxygen electrode were utilised to measure glucose. Concanavalin A has been coupled to graphene quantum dots GQD-Fe3O4 nanosensors in order to detect cancer cells that overexpress glycoproteins. The most accurate biomarker for breast cancer, carbohydrate antigen 15-3 (CA15-3), has been detected using aptamer-based biosensors and impedimetric immunosensors. A biosensor for the real-time evaluation of biotoxicity in the marine environment was built using the symbiotic interaction between Paramecium and Chlorella. With a precision of.001, the silicon-based optical biosensor chips can identify 8 different food allergens, including shrimp, fish, red meat, chicken, wheat, peanuts, and cashew. To maintain a healthy environment, biosensors are definitely the future we can trust upon.