If your jeans have gotten tighter since you tied the knot, your happy marriage could be to blame.

According to recent research by Andrea Meltzer of Southern Methodist University, the happier your marriage, the more likely it is that you will gain weight, HealthDay reported Tuesday.

Meltzer followed 169 newlywed couples for four years, collecting information on their marital satisfaction and weight. The results showed that marital happiness is positively associated with weight gain. Spouses -- both male and female -- who were more satisfied with their relationships tended to gain more weight, while spouses who were less satisfied tended to weigh less.

So what's to blame for the additional pounds? Meltzer told HealthDay that happy couples may feel like their search for a mate is over, causing them to stop engaging in weight-maintaining behaviors. On the other hand, unhappy couples may be considering a divorce and are preparing to attract a new partner.

A September 2012 survey echoed Meltzer's findings -- 46 percent of women surveyed gained weight as a result of a happy relationship, while 27 percent of women lost weight as a result of a breakup.

Check out amazing weight loss success stories in the slideshow below.

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  • John BEFORE

    <a href="http://www.huffingtonpost.com/2014/07/17/i-lost-weight-john-henderson_n_5515251.html" target="_blank">Read John's story here.</a>

  • John AFTER

    <a href="http://www.huffingtonpost.com/2014/07/17/i-lost-weight-john-henderson_n_5515251.html" target="_blank">Read John's story here.</a>

  • Christina BEFORE

    <a href="http://www.huffingtonpost.com/2014/07/14/i-lost-weight-christina-liendro_n_5485541.html" target="_blank">Read Christina's story here.</a>

  • Christina AFTER

    <a href="http://www.huffingtonpost.com/2014/07/14/i-lost-weight-christina-liendro_n_5485541.html" target="_blank">Read Christina's story here.</a>

  • DeAnna BEFORE

    <a href="http://www.huffingtonpost.com/2014/07/07/i-lost-weight-deanna-taylor_n_5379433.html" target="_blank">Read DeAnna's story here.</a>

  • DeAnna AFTER

    <a href="http://www.huffingtonpost.com/2014/07/07/i-lost-weight-deanna-taylor_n_5379433.html" target="_blank">Read DeAnna's story here.</a>

  • Paul BEFORE

    <a href="http://www.huffingtonpost.com/2014/07/10/i-lost-weight-paul-jay-birch_n_5474633.html" target="_blank">Read Paul's story here.</a>

  • Paul AFTER

    <a href="http://www.huffingtonpost.com/2014/07/10/i-lost-weight-paul-jay-birch_n_5474633.html" target="_blank">Read Paul's story here.</a>

  • Kourtney BEFORE

    <a href="http://www.huffingtonpost.com/2014/07/03/i-lost-weight-kourtney-luster_n_5406288.html" target="_blank">Read Kourtney's story here.</a>

  • Kourtney AFTER

    <a href="http://www.huffingtonpost.com/2014/07/03/i-lost-weight-kourtney-luster_n_5406288.html" target="_blank">Read Kourtney's story here.</a>

  • Danielle BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/30/i-lost-weight-danielle-gilmore_n_5379289.html" target="_blank">Read Danielle's story here.</a>

  • Danielle AFTER

    <a href="http://www.huffingtonpost.com/2014/06/30/i-lost-weight-danielle-gilmore_n_5379289.html" target="_blank">Read Danielle's story here.</a>

  • Pamela BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/26/i-lost-weight-pamela-arias_n_5405713.html" target="_blank">Read Pamela's story here.</a>

  • Pamela AFTER

    <a href="http://www.huffingtonpost.com/2014/06/26/i-lost-weight-pamela-arias_n_5405713.html" target="_blank">Read Pamela's story here.</a>

  • Sherlonda BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/23/i-lost-weight-sherlonda-tyrus_n_5310512.html" target="_blank">Read Sherlonda's story here.</a>

  • Sherlonda AFTER

    <a href="http://www.huffingtonpost.com/2014/06/23/i-lost-weight-sherlonda-tyrus_n_5310512.html" target="_blank">Read Sherlonda's story here.</a>

  • Justin BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/16/i-lost-weight-justin-willoughby_n_5310166.html" target="_blank">Read Justin's story here.</a>

  • Justin AFTER

    <a href="http://www.huffingtonpost.com/2014/06/16/i-lost-weight-justin-willoughby_n_5310166.html" target="_blank">Read Justin's story here.</a>

  • Kerry BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/19/i-lost-weight-kerry-hoffman_n_5310330.html" target="_blank">Read Kerry's story here.</a>

  • Kerry AFTER

    <a href="http://www.huffingtonpost.com/2014/06/19/i-lost-weight-kerry-hoffman_n_5310330.html" target="_blank">Read Kerry's story here.</a>

  • Lacy BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/12/i-lost-weight-lacy-lane_n_5276296.html" target="_blank">Read Lacy's story here.</a>

  • Lacy AFTER

    <a href="http://www.huffingtonpost.com/2014/06/12/i-lost-weight-lacy-lane_n_5276296.html" target="_blank">Read Lacy's story here.</a>

  • Marqkria BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/09/i-lost-weight-marqkria-mcmiller_n_5226557.html" target="_blank">Read Marqkria's story here.</a>

  • Marqkria AFTER

    <a href="http://www.huffingtonpost.com/2014/06/09/i-lost-weight-marqkria-mcmiller_n_5226557.html" target="_blank">Read Marqkria's story here.</a>

  • Gina BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/02/i-lost-weight-gina-digregorio_n_5153436.html" target="_blank">Read Gina's story here.</a>

  • Gina AFTER

    <a href="http://www.huffingtonpost.com/2014/06/02/i-lost-weight-gina-digregorio_n_5153436.html" target="_blank">Read Gina's story here.</a>

  • Sarah BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/26/i-lost-weight-sarah-swagler_n_5119632.html" target="_blank">Read Sarah's story here.</a>

  • Sarah AFTER

    <a href="http://www.huffingtonpost.com/2014/05/26/i-lost-weight-sarah-swagler_n_5119632.html" target="_blank">Read Sarah's story here.</a>

  • Emil BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/29/i-lost-weight-emil-oprisa_n_5113935.html" target="_blank">Read Emil's story here.</a>

  • Emil AFTER

    <a href="http://www.huffingtonpost.com/2014/05/29/i-lost-weight-emil-oprisa_n_5113935.html" target="_blank">Read Emil's story here.</a>

  • Nikki BEFORE

    <a href="http://www.huffingtonpost.com/2014/06/05/i-lost-weight-nikki-hauck_n_5160077.html" target="_blank">Read Nikki's story here.</a>

  • Nikki AFTER

    <a href="http://www.huffingtonpost.com/2014/06/05/i-lost-weight-nikki-hauck_n_5160077.html" target="_blank">Read Nikki's story here.</a>

  • Lauren BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/22/i-lost-weight-lauren-richmond_n_5111063.html" target="_blank">Read Lauren's story here.</a>

  • Lauren AFTER

    <a href="http://www.huffingtonpost.com/2014/05/22/i-lost-weight-lauren-richmond_n_5111063.html" target="_blank">Read Lauren's story here.</a>

  • Darrell BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/19/i-lost-weight-darrell-mctague_n_5104908.html" target="_blank">Read Darrell's story here.</a>

  • Darrell AFTER

    <a href="http://www.huffingtonpost.com/2014/05/19/i-lost-weight-darrell-mctague_n_5104908.html" target="_blank">Read Darrell's story here.</a>

  • Jessica BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/12/i-lost-weight-jessica-johnson_n_5002531.html" target="_blank">Read Jessica's story here.</a>

  • Jessica AFTER

    <a href="http://www.huffingtonpost.com/2014/05/12/i-lost-weight-jessica-johnson_n_5002531.html" target="_blank">Read Jessica's story here.</a>

  • After BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/15/i-lost-weight-amanda-clay_n_5070828.html" target="_blank">Read Amanda's story here.</a>

  • Amanda AFTER

    <a href="http://www.huffingtonpost.com/2014/05/15/i-lost-weight-amanda-clay_n_5070828.html" target="_blank">Read Amanda's story here.</a>

  • Miesha BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/05/i-lost-weight-miesha-avery_n_4988688.html" target="_blank">Read Miesha's story here.</a>

  • Miesha AFTER

    <a href="http://www.huffingtonpost.com/2014/05/05/i-lost-weight-miesha-avery_n_4988688.html" target="_blank">Read Miesha's story here.</a>

  • Rachel BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/08/i-lost-weight-rachel-reso_n_4913990.html" target="_blank">Read Rachel's story here.</a>

  • Rachel AFTER

    <a href="http://www.huffingtonpost.com/2014/05/08/i-lost-weight-rachel-reso_n_4913990.html" target="_blank">Read Rachel's story here.</a>

  • Shelly BEFORE

    <a href="http://www.huffingtonpost.com/2014/04/28/i-lost-weight-shelly-matthias_n_4980658.html" target="_blank">Read Shelly's story here.</a>

  • Shelly AFTER

    <a href="http://www.huffingtonpost.com/2014/04/28/i-lost-weight-shelly-matthias_n_4980658.html" target="_blank">Read Shelly's story here.</a>

  • Ernie BEFORE

    <a href="http://www.huffingtonpost.com/2014/05/01/i-lost-weight-ernie-lauro_n_4904095.html" target="_blank">Read Ernie's story here.</a>

  • Ernie AFTER

    <a href="http://www.huffingtonpost.com/2014/05/01/i-lost-weight-ernie-lauro_n_4904095.html" target="_blank">Read Ernie's story here.</a>

  • Dave BEFORE

    <a href="http://www.huffingtonpost.com/2014/04/21/i-lost-weight-dave-douglas_n_4815846.html" target="_blank">Read Dave's story here.</a>

  • Dave AFTER

    <a href="http://www.huffingtonpost.com/2014/04/21/i-lost-weight-dave-douglas_n_4815846.html" target="_blank">Read Dave's story here.</a>

  • Meredith BEFORE

    <a href="http://www.huffingtonpost.com/2014/04/24/i-lost-weight-meredith-white_n_4867161.html" target="_blank">Read Meredith's story here.</a>

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