Q&A for How to Gain Weight if You Are Underweight

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  • Question
    What should you eat if you are underweight?
    Pouya Shafipour, MD, MS
    Board Certified Family Medicine Specialist
    Dr. Pouya Shafipour is a Family Medicine Specialist, Primary Care Physician, and a Weight Loss Specialist based in Santa Monica, California. Dr. Shafipour specializes in dietary, nutritional, behavioral, and exercise counseling to manage obesity and medical conditions related to excessive weight gain or loss. Dr. Shafipour received a BS in Molecular and Cell Biology from the University of California, Berkeley, an MS in Physiology and Biophysics from Georgetown University, and an MD from the Loma Linda University School of Medicine. He completed his internship in general surgery at UC Irvine and a residency in family medicine at the University of California, Los Angeles, and became board certified in family medicine in 2008.
    Board Certified Family Medicine Specialist
    Expert Answer
    Meats, cheeses, and nutritious whole-grain, complex carbohydrates are excellent choices. Make sure that you're eating plenty of complex carbs instead of processed and refined ones. Simple carbohydrates provide little nutritional value and, while they can help you gain weight, can be unhealthy.
  • Question
    Is there a pill or capsule that will make me fat in just one week?
    Patricia Somers, RD, PhD
    Registered Dietitian
    Patricia Somers is a Registered Dietitian and an Associate Professor of the Department of Educational Leadership and Policy at the University of Texas at Austin. She received her RD from the Academy of Nutrition and Dietetics in 1979 and her PhD in Educational Administration (Higher Education Specialization) from the University of New Orleans. She received an Emerging Scholar Award from the American Association of University Women and the Faculty Excellence Award in Research from the University of Arkansas, Little Rock.
    Registered Dietitian
    Expert Answer
    There is no pill that will make you gain weight so quickly. In order to gain weight healthily, the process should be gradual. With that in mind, know that if you eat 250 – 500 extra calories per day, you will gain 1/2 pound – 1 pound per week.
  • Question
    I eat a lot of food but I'm not really gaining weight. Why is that?
    Patricia Somers, RD, PhD
    Registered Dietitian
    Patricia Somers is a Registered Dietitian and an Associate Professor of the Department of Educational Leadership and Policy at the University of Texas at Austin. She received her RD from the Academy of Nutrition and Dietetics in 1979 and her PhD in Educational Administration (Higher Education Specialization) from the University of New Orleans. She received an Emerging Scholar Award from the American Association of University Women and the Faculty Excellence Award in Research from the University of Arkansas, Little Rock.
    Registered Dietitian
    Expert Answer
    To gain weight, you should consume more calories than you burn. A lot of food does not mean that you are consuming a lot of calories. You can keep a food diary for a few days to track how many calories you are eating every day. You can also take your food diary to a professional. They may be able to help you calculate how many calories you need to eat to gain weight.
  • Question
    Is it normal that I can gain and lose weight in the same week?
    Patricia Somers, RD, PhD
    Registered Dietitian
    Patricia Somers is a Registered Dietitian and an Associate Professor of the Department of Educational Leadership and Policy at the University of Texas at Austin. She received her RD from the Academy of Nutrition and Dietetics in 1979 and her PhD in Educational Administration (Higher Education Specialization) from the University of New Orleans. She received an Emerging Scholar Award from the American Association of University Women and the Faculty Excellence Award in Research from the University of Arkansas, Little Rock.
    Registered Dietitian
    Expert Answer
    Weight that fluctuates throughout the week may be water weight. You may want to try weighing yourself once a week in the morning instead of every day.
  • Question
    I have had a heart problem since childhood. How do I gain weight?
    Patricia Somers, RD, PhD
    Registered Dietitian
    Patricia Somers is a Registered Dietitian and an Associate Professor of the Department of Educational Leadership and Policy at the University of Texas at Austin. She received her RD from the Academy of Nutrition and Dietetics in 1979 and her PhD in Educational Administration (Higher Education Specialization) from the University of New Orleans. She received an Emerging Scholar Award from the American Association of University Women and the Faculty Excellence Award in Research from the University of Arkansas, Little Rock.
    Registered Dietitian
    Expert Answer
    You should consult your doctor for healthy ways to gain weight with your particular condition.
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