Unplanned Weight Loss: Nutrition Tips
Some weight changes in life are expected. For example, people may lose weight if they change their exercise or eating habits.
But weight loss can happen for reasons that you would not usually expect. For example, medical problems can cause unplanned weight loss. These include problems with your thyroid gland, long-term infections, mouth or throat problems that make it hard to eat, and digestive problems. They also include depression and cancer. Some medicines also may cause you to lose weight.
Talk to your doctor if you have unplanned weight loss. Your doctor may suggest making changes in what you eat to help you gain back the weight you lost. The doctor may also refer you to a dietitian.
How can you gain weight and get the nutrition you need?
There are things you can do to help gain back weight and get the nutrition you need.
- Add calories to your diet. Adults who need to gain weight should choose higher-calorie foods that are packed with nutrients, like the options below.
- If you struggle with your appetite, eat 5 or 6 smaller meals a day. Larger meals can cause nausea and make you feel not like eating.
- Get enough protein. Higher-protein meals can help maintain muscle mass. Drinking high-calorie, protein-rich drinks between meals can also boost calories.
Try these tips for choosing foods that support healthy weight gain.
- Eat meals and snacks that include higher-calorie foods like cheese, peanut butter, almond butter, nuts, or dried fruit. You can put cheese on crackers or sandwiches, or add it to soups and salads. Or try using peanut butter in sandwiches, or spread it on bread, bagels, bananas, or celery.
- Choose higher-fat dairy, 2% or higher.
- Try hard, full-fat cheese like cheddar, Colby, Swiss, and paneer, or soft cheese like brie, fontina, or mozzarella.
- Add healthy fats to salads by using nuts, seeds, avocados, and whole olives.
- Prepare hot cereals with milk rather than water.
- Use powdered milk or higher-fat milk to add calories to soups, stews, and casseroles.
- Add canned beans or lentils to soups and stews.
A nutrition supplement helps when you can’t meet your nutrient needs through food alone.
Where can you learn more?
Go to https://www.healthwise.net/patientEd
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Adaptation Date: 09/23/2026
Adapted By: Alberta Health Services
Adaptation Reviewed By: Alberta Health Services