How to Gain Weight Healthily: A Simple Guide for Beginners

Hot peanut butter and blackberry jam sandwich on homemade toast - Massachusetts, USA.

To gain weight healthily, eat a little more than your body burns every day, mostly from nutrient-dense foods, get enough protein, and do strength training so the extra energy builds muscle rather than just fat. The NHS suggests adding roughly 300 to 500 extra calories a day and gaining gradually. Sleep and patience do the rest.

This guide is for anyone who struggles to put on weight, whether because of a small appetite, a fast metabolism, a busy life or recovery from illness, and wants to get stronger rather than just heavier.

Key takeaways

  • A modest daily surplus of about 300 to 500 calories is easier to sustain and leads to less unwanted fat gain than eating everything in sight.
  • Build extra calories from foods like nuts, nut butters, whole milk, yogurt, eggs, oats, rice, beans and olive oil, not mainly sweets and fast food.
  • Aim for enough protein spread across the day and train with weights at least two days a week.
  • Smaller, more frequent meals and calorie-rich drinks help if your appetite is low.
  • Sudden or unexplained weight loss needs a doctor before any diet plan.

Why might you be underweight?

Before changing what you eat, it helps to know why your weight is low. For many people it comes down to consistently eating less than they burn, often because appetite is small, meals feel like a chore, or busy days mean skipped lunches. Some people naturally have a lean build and burn through energy quickly.

Other causes need medical attention, including an overactive thyroid, digestive conditions such as inflammatory bowel disease or celiac disease, some medicines, long-term stress or depression, and eating disorders. The NHS advice for underweight adults recommends seeing a doctor if you've lost weight suddenly, lost weight without changing your diet or activity, or use controlling food as a way to cope with feelings. Those signs can point to an underlying condition that eating more won't fix.

How many extra calories do you need?

To gain weight you need a calorie surplus, meaning you eat more energy than you use. A modest surplus of about 300 to 500 calories a day is a sensible starting point for most people. It's slow enough that your body can put more of the gain into muscle, especially if you're lifting weights, and it's easier to keep up week after week.

A huge surplus, sometimes called a "dirty bulk," moves the scale faster but adds more fat. Many people then try to diet it off and lose some of the muscle they worked for. Unless you're an athlete on a specific plan, slow and steady wins.

To find a starting point, use an online calculator to estimate your daily energy needs, add a few hundred calories, and stick with it for two to three weeks. Then adjust based on what the scale and the mirror tell you.

What should you eat to gain weight healthily?

The quality of the extra calories matters. Gaining weight on crisps, pastries and sugary drinks tends to add fat and can leave you short of the nutrients your body needs. The NHS specifically warns against relying on chocolate, cakes and sugary drinks.

Foods that pack plenty of energy into a small volume make the job easier:

  • Healthy fats: nuts, nut butters, seeds, avocado, olive oil
  • Dairy: whole milk, full-fat yogurt, cheese; see our guide to dairy nutrition if you're unsure how much fits
  • Protein foods: eggs, fish such as salmon, chicken, lean meat, tofu, tempeh, beans and lentils
  • Starchy carbs: oats, rice, potatoes, wholegrain bread, pasta, quinoa
  • Easy extras: dried fruit, trail mix, granola

Adding healthy fat to meals is the simplest trick. A drizzle of olive oil on vegetables, a spoonful of nut butter in porridge, or a handful of seeds on yogurt adds energy without making the plate bigger.

How much protein do you need?

If you're gaining weight, you want as much of it as possible to be muscle, and that needs protein plus training. The International Society of Sports Nutrition position stand suggests 1.4 to 2.0 grams of protein per kilogram of body weight per day is enough for most people who exercise. For someone weighing 60 kg, that's roughly 85 to 120 grams a day.

Spreading protein across three or four meals is generally better than packing it all into one. Whole foods should be the base, but a shake can help on busy days. If you prefer to avoid sweeteners, see our guide to clean protein shakes. More isn't always better, though; our piece on too much protein covers the downsides of going overboard.

Why strength training matters

Eating more without training tends to add mostly fat. Resistance training is the signal that tells your body to use the extra energy to build muscle. The NHS physical activity guidelines recommend strength activities that work all the major muscle groups on at least two days a week. For weight gain, three sessions is a good target.

Beginners do well with compound movements that work several muscles at once: squats, deadlifts or hip hinges, push-ups or bench press, rows and overhead presses. A simple plan is three full-body sessions a week, three or four exercises per session, three sets of 8 to 12 reps. Add a little weight or a rep or two when the last set feels comfortable. That steady increase, called progressive overload, is what drives growth.

Expect some soreness in the first weeks. What to avoid is training hard every day; muscle is built during recovery, not during the workout itself. A side benefit the NHS mentions is that exercise can also improve appetite.

A simple day of eating for weight gain

The most common reason people fail to gain is not eating often enough. If big meals feel overwhelming, eat five or six smaller ones. Here's what a day might look like:

TimeExample
BreakfastOats made with whole milk, banana, peanut butter and seeds
Mid-morningFull-fat yogurt with granola
LunchRice, salmon or beans, vegetables with olive oil, avocado
AfternoonTrail mix or wholegrain toast with cheese
DinnerChicken or tofu, potatoes, vegetables, a side of lentils
Evening (optional)Milky drink or cottage cheese with fruit

Liquid calories are especially helpful with a small appetite. A smoothie with whole milk, banana, oats, nut butter and protein powder can add several hundred calories and is usually easier to finish than a large plate of food. The NHS suggests having drinks like this between meals rather than just before, so they don't fill you up. If you dislike shakes, protein energy balls are a handy snack alternative.

Don't forget digestion, sleep and stress

If eating more leaves you bloated or uncomfortable, it's harder to keep going. Increase portions gradually and include fiber and fermented foods in reasonable amounts; our list of easy ways to improve your gut health has practical ideas. If digestive symptoms are persistent, see a doctor, since conditions that affect absorption can be one reason weight is hard to gain.

Sleep is where much of your recovery happens. Short or broken sleep makes training feel harder and can blunt your appetite or push you toward less nutritious food. Aim for a regular bedtime and a dark, cool room.

Stress and low mood can quietly suppress appetite. If you notice you stop eating when you're anxious or down, that's worth addressing directly, with support from a doctor or therapist if needed.

Special situations

The basics above apply to most adults, but a few groups need a slightly different approach:

  • After illness or surgery. Appetite may be low for weeks. Focus first on small, frequent, easy-to-eat foods and drinks, and follow any advice from your care team before starting heavy training.
  • Older adults. Unintended weight loss later in life is more often linked to a health problem, medicines, dental issues or difficulty shopping and cooking. A doctor's check is especially worthwhile, and gentle strength work helps protect muscle.
  • Vegetarians and vegans. Beans, lentils, tofu, tempeh, nuts, seeds and soy milk can cover both calories and protein. Combining several sources across the day makes it easier.
  • Anyone with a history of disordered eating. Tracking calories and weighing yourself can be unhelpful. Work with a doctor, dietitian or therapist rather than following a plan alone.

How to track progress

Body weight naturally swings from day to day with water and food. Weigh yourself at the same time, ideally first thing in the morning, and look at the weekly average rather than single readings. Also track:

  • Strength in your main lifts
  • How your clothes fit
  • Energy levels and appetite
  • Monthly photos, which often show changes the scale misses

If the weekly average hasn't moved after two or three weeks, add another 100 to 200 calories a day. If you're gaining quickly and most of it seems to be around your middle, trim the surplus slightly. Small, patient adjustments work better than big swings.

Common mistakes that slow progress

  • Impatience. Healthy muscle gain is slow. Expect months, not weeks.
  • Inconsistency. A few big days followed by skipped meals averages out to no surplus.
  • Skipping strength training. Without it, extra calories have nowhere useful to go.
  • Relying on junk food. It adds weight but not the health you're after.
  • Ignoring warning signs. Weight that keeps falling despite eating more needs a doctor.

Frequently asked questions

How fast can I gain weight healthily?

A gradual pace is best. With a surplus of a few hundred calories a day, many people see the scale creep up slowly over weeks, with a larger share of the gain coming from muscle if they're strength training. Faster gain usually means more fat. Judge progress by weekly averages, strength and how clothes fit, and give any plan at least two to three weeks before adjusting.

Can I gain weight without going to the gym?

Yes. Bodyweight exercises such as squats, lunges, push-ups and rows with resistance bands at home can build muscle, especially for beginners. Yoga and other strength-based activities also count. What matters is working all the major muscle groups at least twice a week and gradually making the exercises harder. Without any resistance training, more of the gain is likely to be fat.

Do I need weight gain supplements?

Usually not. Most people can meet their needs with regular meals, snacks and calorie-rich drinks made from everyday foods. A protein powder can be convenient if you struggle to hit your protein target, but it's optional. Be cautious with products making big promises, and talk to a doctor or dietitian before using supplements if you have a health condition.

What to do next

  • Estimate your daily energy needs and add about 300 to 500 calories, spread across five or six eating occasions.
  • Start three full-body strength sessions this week, even if they're short.
  • Add one calorie-dense snack or smoothie between meals every day.
  • See a doctor if your weight loss was sudden, unexplained or linked to how you cope with feelings about food.

This article is for general information and is not medical advice. If you're underweight, have lost weight without trying, or have a medical condition, speak to a doctor or registered dietitian before changing your diet.

Sources

Last reviewed: October 2026.

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