Why Can't I Gain Weight? Nutrition and Absorption Issues - Nutrition

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No matter how much I eat, I can't seem to gain weight..?


Hello, Nutritionist: I calculated my BMI from the website and found it to be 17.34, which is clearly on the low side.
My meal times are sometimes irregular, and I engage in a small amount of exercise daily.
I consistently go to bed before 12:30 AM, but my weight has not changed for several years, regardless of whether I eat more or less.
Is this due to an unbalanced diet, or could it be that my intestines are not absorbing nutrients effectively?

cruise, 20~29 year old female. Ask Date: 2005/09/08

Dr. Hu Yuqing reply Nutrition


Hello, Cruise: A 22-year-old male typically has a lower body mass index (BMI) if he is generally healthy and not frequently ill, which means he has a good potential for gaining weight in the future.
I personally believe there is nothing wrong with that.
Currently, your caloric intake is balanced with your caloric needs, which has resulted in your current weight.
The priority in your diet should be balanced nutrition.
Please refer to the Department of Health's food information website for more details.
Due to our hospital's proxy settings, I am unable to access http://food.doh.gov.tw, so I cannot provide you with the information directly.
Wishing you good health.
Response from Dietitian Hu Yu-Ching.
940908 Thursday.

Reply Date: 2005/09/08

More Info


Hello! Thank you for reaching out with your concerns about weight gain and nutrition. Based on your BMI of 17.34, it is clear that you are underweight, and it’s important to address this issue with a comprehensive understanding of nutrition and potential absorption problems.

First, let’s discuss the factors that could be contributing to your inability to gain weight. One of the primary reasons could indeed be an imbalance in your diet. If your meals lack essential nutrients, such as proteins, healthy fats, and carbohydrates, your body may not be receiving the necessary calories to support weight gain. A well-balanced diet is crucial for overall health and weight management. It’s important to include a variety of foods from all food groups: lean proteins (like chicken, fish, beans, and legumes), whole grains (such as brown rice, quinoa, and whole-grain bread), healthy fats (like avocados, nuts, and olive oil), and plenty of fruits and vegetables.

Another possibility is that your body may not be absorbing nutrients effectively. This could be due to gastrointestinal issues such as malabsorption syndromes, which can stem from conditions like celiac disease, Crohn's disease, or other digestive disorders. If your intestines are not absorbing nutrients properly, even if you are consuming enough calories, your body may not be able to utilize them effectively. It would be wise to consult with a healthcare professional who can evaluate your digestive health and possibly recommend tests to check for any underlying conditions.

Additionally, your eating patterns could be affecting your weight. You mentioned that your meal times are not fixed, which can lead to irregular eating habits. Regular meal times can help regulate your metabolism and ensure that you are consuming enough calories throughout the day. It might be beneficial to establish a routine where you eat three balanced meals and include healthy snacks in between. This can help increase your overall caloric intake.

Stress and lifestyle factors can also play a significant role in weight management. If you are experiencing high levels of stress or anxiety, this can affect your appetite and eating habits. Make sure to incorporate stress-reducing activities into your daily routine, such as exercise, meditation, or hobbies that you enjoy.

In terms of exercise, while you mentioned that you engage in some physical activity, it’s important to ensure that your exercise routine is not excessively high in intensity or volume, as this could lead to further calorie deficits. Instead, focus on strength training exercises that can help build muscle mass, which can contribute to healthy weight gain.

Lastly, if you are concerned about your weight and nutritional status, I highly recommend consulting with a registered dietitian or a healthcare provider. They can provide personalized guidance and support tailored to your specific needs, including meal planning and addressing any potential health issues.

In summary, gaining weight in a healthy manner involves a combination of balanced nutrition, regular meal patterns, and addressing any underlying health issues. By focusing on these areas, you can work towards achieving a healthier weight and overall well-being. Remember, it’s essential to be patient with yourself during this process, as healthy weight gain takes time and consistency.

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