The most effective thing you can take to gain weight is a consistent caloric surplus of roughly 300 to 500 extra calories per day beyond what your body burns. That translates to about 1 to 2 pounds gained per week. But the specific foods, drinks, and supplements you choose to hit that surplus matter a lot for whether you gain mostly muscle or mostly fat, and for how you feel along the way.
High-Calorie Whole Foods That Add Up Fast
Before reaching for any supplement, the foundation of healthy weight gain is calorie-dense whole food. Some foods pack far more energy per bite than others, and leaning on these makes it much easier to stay in a surplus without feeling stuffed all day.
Nuts and nut butters are among the easiest options. A quarter cup of most nuts delivers 160 to 200 calories, and you can stir nut butter into oatmeal, smoothies, or yogurt without much effort. Cheese is another workhorse: just an ounce and a half of sharp cheddar provides about 173 calories plus 10 grams of protein, and Swiss cheese is similar at 167 calories with 11 grams of protein. Avocados contribute around 240 calories per whole fruit along with healthy fats. Olive oil, coconut oil, and butter can be added to cooking or drizzled over meals to boost calorie counts by over 100 calories per tablespoon.
Other reliable staples include whole eggs, full-fat yogurt, granola, dried fruit, salmon, and starchy carbohydrates like rice, potatoes, and whole-grain bread. The strategy is simple: build every meal and snack around foods that are naturally calorie-dense rather than trying to eat enormous volumes of low-calorie food.
Why Liquid Calories Work So Well
If you struggle with appetite, drinking your calories is one of the most practical strategies available. Research published in the Proceedings of the Nutrition Society confirms that liquid foods have a lower satiating capacity than solid foods. Your body’s early-stage fullness signals are much weaker (or absent) when calories come in liquid form, which means you can consume more total energy throughout the day without feeling overly full.
Homemade smoothies are ideal. A blender lets you combine milk or yogurt, a banana, nut butter, oats, and honey into a single drink that can easily exceed 500 to 700 calories. Drinking one of these between meals, rather than replacing a meal, adds calories on top of what you already eat. Whole milk on its own provides about 150 calories per glass and is one of the simplest daily additions.
One interesting exception from the satiety research: soup fills you up more than other liquids, likely because of slower consumption and the combination of warmth and volume. So while smoothies and shakes are great for adding calories, soups are better when you want a satisfying meal without overeating.
Protein Powder vs. Mass Gainers
These are the two most popular supplement categories for weight gain, and they serve different purposes.
Standard whey protein powder is a concentrated protein source. Whey protein isolate contains over 90% protein by weight, with minimal fat and carbohydrates. It helps you hit your protein target for the day, which matters for building lean muscle, but it won’t dramatically increase your calorie intake on its own. A typical serving adds 100 to 150 calories.
Mass gainers are calorie bombs by design. They combine protein, carbohydrates, and fats into a single serving that delivers 500 to 1,200 calories. A typical serving might weigh around 120 grams but contain only 25 grams of protein, with the rest coming from carbs and fats. Higher-end products offer better ratios, with some providing 770 calories, 55 grams of protein, and over 100 grams of carbohydrates per serving.
Mass gainers are useful if you genuinely cannot eat enough food. But they’re expensive compared to whole food, and many brands are loaded with added sugar. If you can manage to eat regular meals and add a homemade smoothie or two, you’ll get the same calorie surplus for less money and better nutrition.
How Much Protein You Actually Need
If your goal is gaining lean muscle rather than just body fat, protein intake is the most important nutritional variable after total calories. People who regularly lift weights need 1.2 to 1.7 grams of protein per kilogram of body weight daily, according to Mayo Clinic guidelines. For a 150-pound person (68 kg), that works out to roughly 82 to 116 grams per day.
Spreading protein across three to four meals produces better results than loading it all into one sitting. Your body can only use so much protein for muscle building at a time, so 25 to 40 grams per meal is a practical target for most people.
Creatine for Weight and Muscle
Creatine monohydrate is one of the most well-studied supplements in sports nutrition, and it reliably increases body weight. It works through multiple pathways: it draws more water into muscle cells (increasing cellular hydration), supports the replenishment of your muscles’ primary short-burst energy source, and enhances glycogen storage. Over time, it also supports muscle growth by influencing growth factors and the cells responsible for muscle repair.
The standard maintenance dose is 3 to 5 grams per day, or roughly 0.03 grams per kilogram of body weight. Some people start with a higher “loading” phase, but simply taking the maintenance dose daily will get you to the same place within a few weeks. The initial weight gain from creatine is partly water weight, typically 2 to 4 pounds in the first few weeks, but consistent use combined with resistance training supports genuine muscle gain over months.
Zinc and Appetite
If your appetite is low, a micronutrient deficiency could be part of the problem. Zinc deficiency in particular causes appetite loss, growth issues, and changes in taste perception. Research has shown that zinc stimulates food intake by activating hunger-related signaling through the vagus nerve, which connects your gut to your brain. In studies on zinc-deficient animals, restoring zinc levels rapidly increased food intake by boosting the activity of hunger-promoting brain chemicals.
This doesn’t mean zinc supplements will supercharge the appetite of someone who already has adequate levels. But if you’ve been eating a restrictive diet, avoiding meat, or have digestive issues that impair absorption, getting your zinc status checked (and correcting a deficiency) could make eating feel less like a chore. Good food sources of zinc include red meat, shellfish, pumpkin seeds, and legumes.
Prescription Appetite Stimulants
For people with medical conditions that cause severe appetite loss or wasting, there are FDA-approved prescription medications. These include megestrol acetate, oxandrolone, and dronabinol. They are primarily prescribed for conditions like AIDS-related wasting and appetite loss associated with advanced cancer. These are not casual supplements. They carry significant side effects and are reserved for clinical situations where weight loss is dangerous and dietary changes alone aren’t enough.
Weight Gain Products to Be Cautious About
The FDA has found that some bodybuilding and weight gain products sold over the counter illegally contain anabolic steroids or steroid-like substances. These are associated with serious liver injury, kidney damage, heart attack, stroke, and blood clots. Other reported effects include severe acne, hair loss, mood changes, increased aggression, depression, and sexual dysfunction.
The risk increases with “stacking,” where people combine multiple products at once. Because dietary supplements are not reviewed by the FDA before hitting store shelves, a product’s label may not reflect what’s actually inside. Any weight gain pill that promises dramatic results in a short time frame should be treated with skepticism. Stick to established supplements like protein powder and creatine from reputable, third-party tested brands.
When Low Weight Needs Medical Attention
If you’ve lost 5% or more of your body weight over the past 6 to 12 months without trying, that meets the clinical threshold for unintentional weight loss and warrants investigation. More urgent benchmarks include losing 5% in just 30 days or 10% in 6 months. Unintentional weight loss can signal thyroid disorders, digestive conditions, diabetes, depression, or other underlying issues that no amount of extra calories will fix on their own. Addressing the root cause first makes any weight gain strategy far more effective.