Losing weight without trying can stem from stress, mental health changes (depression, anxiety), or underlying medical conditions like thyroid issues, diabetes, digestive problems (celiac, IBD), or even certain cancers, requiring a doctor's visit if it's significant (over 5% of body weight in 6-12 months) or persistent, as it indicates your body isn't absorbing nutrients properly or burning more calories than usual.
Some causes of unintentional weight loss include: mental health conditions, such as depression, anxiety, eating disorders and obsessive compulsive disorder (OCD) problems with digestion, such as coeliac disease or inflammatory bowel disease (IBD) hormone conditions, such as an overactive thyroid or type 1 diabetes.
Here are some of the best ways to get your metabolism back on track.
These stages are: rapid weight loss, slow weight loss, and a plateau phase. Each stage presents different challenges, physiologically and emotionally.
Can unexplained weight loss be prevented?
Eat small, frequent meals to help build a healthy appetite. Plan for 3 meals and 2-3 snacks each day. Quick Snack ideas – crackers and cheese, yogurt and fruit, peanut butter toast, fruit and nut mixes, hard boiled eggs, tuna or egg salad on crackers.
Contact your provider if: You or a family member loses more weight than is considered healthy for their age and height. You have lost more than 10 pounds (4.5 kilograms) or 5% of your normal body weight over 6 to 12 months or less, and you do not know the reason. You have other symptoms in addition to the weight loss.
Weight loss can be blocked by hitting a plateau (metabolism slows), eating hidden calories, not tracking intake, hormonal issues (like thyroid, cortisol), poor sleep/high stress, lack of protein/too many carbs, or medical conditions/medications, often requiring a holistic approach to adjust calories, activity, and lifestyle factors.
You can lose weight everywhere, but it may not happen at the same time. Here's what happens at each major body part when you start losing weight: Your face will slim down first because fat deposits are easier to shift than muscle mass and water retention (so don't freak out if your face looks different).
Other symptoms linked to unintentional weight loss can include:
Fortunately, lifestyle changes and addressing underlying causes can help to speed up the metabolism.
For example, green tea contains catechins and caffeine, both of which may increase the number of calories you burn. Drinks with apple cider vinegar, lemon, ginger, or cayenne pepper may also gently aid your metabolic functions. The best part? These drinks are simple to prepare and easy to include in your daily habits.
What Are Some Causes of Unexplained Weight Loss?
If you're losing weight without trying, talk with your healthcare professional. As a rule of thumb, losing more than 5% of your weight over 6 to 12 months is a concern if the weight loss is not intentional.
This is due to the body not having enough nutrition to repair the muscle mass damaged during exercise. The way to burn fat while losing the least amount of muscle mass is through weight training, such as exercising by lifting weights or exercising by lifting your own body weight.
What are the first signs you're losing weight?
The most well-known is ghrelin, the 'hunger hormone', which is mainly secreted by the stomach. If you don't sleep enough, levels of that hormone will be higher, and you will feel hungrier and consume more calories. Over the long term, this leads to weight gain.
Men's bodies generally respond to dieting by the loss of more weight at their trunk and women typically shed the excess weight from the hips area. The causes of it are related both to hormonal influence and the application of whole-body composition.
Your most consistent and "true" weight is generally in the morning, after using the restroom and before eating or drinking anything, because your body has had time to digest overnight, leading to less fluctuation from food, liquids, and daily activities. Weighing at the same time, with minimal clothing, and under consistent conditions helps track trends more accurately than weighing at night when weight is higher due to meals and hydration.
The 3-3-3 rule for weight loss is a simple, habit-based method focusing on three key areas: 3 balanced meals a day, 3 bottles (or ~1.5L) of water by 3 PM, and 3 hours of physical activity per week, aiming for consistency over complex diets. It simplifies fat loss by establishing rhythm through consistent eating, adequate hydration to support metabolism, and regular movement, promoting sustainable health without intense calorie counting or restrictive rules, says Five Diamond Fitness and Wellness, Joon Medical Wellness & Aesthetics, and EatingWell.
Ozempic is typically recommended for individuals who have a BMI of 30 or higher, which falls into the obese category, or for those with a BMI of 27 or higher who have additional health concerns such as high blood pressure, type 2 diabetes, or high cholesterol.
Weight loss is more common in some cancer types. About 60 out of 100 people with lung cancer (60%) have a loss of appetite and significant weight loss at the time of their diagnosis. In people with upper gastrointestinal cancer, this number is 80 out of 100 people (80%).
Commonly prescribed weight loss medications include:
Stress can also lead to other poor eating habits like snacking instead of eating full meals. The stress hormones that our bodies release can speed up our metabolism, causing us to burn calories faster and lose weight too quickly.