Weight gain - unintentional medlineplus.gov/ency/article/003084.htm medlineplus.gov/ency/article/003084.htm https://medlineplus.gov/ency/article/003084.htm medlineplus.gov/ency/article/003084.htm metabolism starts slowing down U.S. National Library of Medicine Weight gain - unintentional https://www.nlm.nih.gov/medlineplus/ency/article/003084.htm medlineplus.gov/ency/article/003084.htm https://medlineplus.gov/ency/article/003084.htm Medline Plus: Weight Gain-Unintentional medlineplus.gov/ency/article/003084.htm gain metabolism starts slowing down MedlinePlus: Weight Gain: Unintentional MedlinePlus: Weight Gain: Unintentional Medline Plus: Weight Gain-Unintentional