Unexplained Weight Loss: the Causes and Concerns

Unexplained weight loss?

Hello doctor, I am 163 cm tall and my weight fluctuates between 85-86 kg.
I have been controlling my diet, consuming about 1200-1500 calories per day, but I only drink around 1500 cc of water daily, so my weight hasn't changed much.
Recently, I noticed that my weight has started to decrease: on November 27, it was 86.4 kg, on December 4 it was 85.4 kg, and on December 11 it was 84.6 kg.
Then, from December 12 to December 18, I tried to eat a bit more, consuming about 2000 calories per day.
On December 18, my weight was 85.1 kg, and then I returned to my previous eating habits.
However, today, December 23, I weighed 83.4 kg.
Is this a concerning weight loss? Additionally, I have increased my daily water intake to around 2500 cc over the past month, and for the past three weeks, I have been walking for 30 minutes after meals.
Could these changes have led to an increase in my basal metabolic rate?

Mr. Lin, 30~39 year old female. Ask Date: 2019/12/23

Dr. Hong Yuanbin reply Internal Medicine

Hello, based on your description, if you do not have any specific physical discomfort, this weight change should be within the physiological range.
For example, your weight will typically be lower in the morning after fasting overnight, and it will naturally be higher in the afternoon or evening after eating.
Additionally, your weight can be significantly affected by hydration status before weighing.
It is recommended to weigh yourself at a consistent time, such as after waking up and before breakfast.
If your weight continues to decline persistently, then it would be advisable to seek medical evaluation.
Thank you for your inquiry.

Reply Date: 2019/12/23

More Info

Hello! It sounds like you're experiencing some significant changes in your weight, and it's understandable to be concerned about unexplained weight loss. Let's break down the potential causes and considerations regarding your situation.

First, it's important to recognize that weight fluctuations can occur for a variety of reasons, including changes in diet, physical activity, hydration levels, and even underlying health conditions. In your case, you've mentioned that your weight has been gradually decreasing despite your efforts to maintain a caloric intake of around 1200-1500 calories per day, and even after increasing your intake to about 2000 calories for a short period.

One possible explanation for your weight loss could be related to your increased water intake and physical activity. Drinking more water can lead to temporary weight loss due to the loss of water weight, especially if you were previously not hydrating adequately. Additionally, incorporating regular walking after meals can boost your metabolism and contribute to weight loss. However, it's essential to ensure that your caloric intake is sufficient to support your energy needs, especially if you're increasing your activity levels.

Another factor to consider is your body's metabolic rate. The basal metabolic rate (BMR) can be influenced by several factors, including muscle mass, age, and overall health. If you've been more active and possibly building muscle, your BMR might have increased, leading to more calories burned at rest. However, if your caloric intake is not meeting your energy expenditure, this could result in weight loss.

It's also crucial to consider any potential underlying health issues that could be contributing to your weight loss. Conditions such as hyperthyroidism, diabetes, gastrointestinal disorders, or even certain cancers can lead to unexplained weight loss. If you've noticed other symptoms, such as fatigue, changes in appetite, or gastrointestinal issues, it would be wise to consult a healthcare professional for a thorough evaluation.

In your case, since you've experienced a notable drop in weight over a relatively short period, it would be advisable to monitor your weight closely and consider seeking medical advice. A healthcare provider can perform necessary tests to rule out any underlying conditions and provide personalized recommendations based on your health status.

In summary, while your increased water intake and physical activity may contribute to your weight loss, it's essential to consider other factors that could be at play. If you're concerned about your weight loss or if it continues, please consult a healthcare professional for a comprehensive assessment. They can help you understand the reasons behind your weight changes and guide you on the best path forward for your health and well-being.

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