Protein deficiency is a condition where the body lacks the adequate amount of protein required for proper functioning. It can lead to several health issues such as slow growth, weak muscles, fatigue, and poor immune system. There are several synonyms for this condition, including protein inadequacy, protein insufficiency, protein shortage, and protein deprivation. It is essential to consume foods that are rich in protein such as meat, fish, eggs, and beans. Vegetarians can also get their daily dose of protein from plant-based sources such as soy, lentils, nuts, and seeds. In case of severe protein deficiency, it is advised to consult a medical professional.