The study found getting a wedding ring on your finger - and losing it - could cause people's weight to rise
Both marriage and divorce can trigger weight gain, according to research being presented at the American Sociological Association.
Newly-married women were at greatest risk of "large" weight gains.
Some gains may "pose a health risk", say the authors from Ohio State University.
The study followed people from 1986 to 2008 and monitored changes in body mass index (BMI) - a weight/height ratio measurement - and marital status.
The researchers compared the BMI of people who married or divorced with those who were already married or stayed single.
Life-changing
Even after adjusting the data for each person's health, education, employment, poverty and pregnancy - there was still an increased risk of weight gain associated with marriage and divorce.
“These are significant changes in someone's life. It can change their living situation and the types of food they eat”
- Helen Riley British Nutrition Foundation-
In women, marriage increased the risk of a small increase in weight (up to a three point increase in BMI) by 33%. There was a 48% higher risk of large weight gains (more than a three point BMI increase).
Newly-divorced women had a 22% increased risk of small weight gain.
Men were 28% more likely to have small increases in weight after marriage and 21% after divorce.
The report concludes: "All marital transitions act as a weight shock, encouraging small weight gains regardless of the destination marital state."
Lead author, Dmitry Tumin, said: "To some extent, marriages for women promote weight gains that may be large enough to pose a health risk."
Helen Riley at the British Nutrition Foundation charity said: "These are significant changes in someone's life. It can change their living situation and the types of food they eat.
"But different people deal with it in different ways and it can be positive for some people."
BBC News HEALTH
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