Antonyms for the term "vitamin B deficiency" would be the presence of enough or adequate levels of vitamin B in the body. This can be achieved through a balanced diet that includes foods rich in vitamin B, such as eggs, dairy products, meat, fish, green leafy vegetables, and whole grains. Adequate levels of vitamin B contribute to the proper functioning of the nervous system, the formation of red blood cells, and the production of energy. Symptoms of vitamin B deficiency include fatigue, weakness, tingling in the hands and feet, and difficulty with memory and concentration. Maintaining sufficient levels of vitamin B is essential for overall health and wellbeing.