The demand for flexible devices is rapidly increasing due to their ability to overcome the limitations of conventional bulk electronics in wearable technologies. Nowadays, the highest-performance flexible devices still rely predominantly on synthetic polymers that have significant environmental impact. Consequently, a wide interest has emerged in developing alternatives to these materials that are both biodegradable and biocompatible. Gelatin is a natural polymer derived from animal skin that intrinsically possesses both properties, making it a promising candidate for flexible sensing. Upon methacrylation, gelatin becomes photoresponsive, enabling photopolymerization a process capable of creating specialized three dimensional geometries improving the device performance. Based on this approach a Gelatin Methacrylated (GelMA) hydrogel was investigated and demonstrated high sensibilities as a tensile sensor, exhibiting a gauge factor of approximately 2.1.