Pressure changes can disrupt the gases in the digestive system and cause them to expand, leading to discomfort, bloating, and sometimes nausea. There's also the fact that when you're traveling via plane, car, or train, your usual diet has to change.
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Vacation weight gain is often largely waterCelebrations and vacations can involve eating foods higher in carbs and salt than your normal diet, and both of these lead to water retention, she said.
Weight gained after a vacation or indulgent weekend is likely caused by water retention not fat, experts told Insider after actor Rebel Wilson said she put on three kilograms (almost seven pounds) while at an all-inclusive resort.