The cause of Ménière's disease is unknown, but it may be related to a fluid imbalance in your inner ear. When the fluid builds up, it causes excess pressure. This pressure affects the sensory systems in your inner ear that are used to maintain balance, which leads to episodes of vertigo.
If you have Ménière's disease, eating less salt (sodium) may help. Salt "attracts" fluids, so it makes your body retain excess fluid. Eating less salt may result in less buildup of fluid in your ear.
Episodes of vertigo can be severe. Eating less salt does not reduce the intensity or severity of vertigo.
But eating less salt may reduce the frequency of episodes, and:
Fewer episodes of vertigo may also reduce problems with balance.
Fewer episodes of vertigo means a better quality of life.
Eating less salt doesn't have to be hard, but you do have to think about it. Salt is in many foods, so limiting your salt intake means more than just not using the salt shaker. Packaged (processed) foods and restaurant foods are usually quite high in salt.
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