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question

How is it possible to gain a lot of weight overnight?

National Academy of Sports Medicine
National Academy of Sports Medicine
answer

Suddenly gaining more than 4 to 5 pounds of weight overnight may be a sign of a serious condition that should be addressed by a medical professional.  Generally, overnight weight gain is usually caused from fluid retention.  Consuming foods that are high in sodium (such as salt) can cause the body to hold on to water. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.