Science-backed ways to lose weight
Intermittent fasting (IF) is a pattern of eating that involves regular short-term fasts and consuming meals within a shorter time period during the day.
Alternate day fasting
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 (ADF): Fast every other day and eat normally on non-fasting days. The modified version
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 involves eating just 25–30 percent of the body’s energy needs on fasting days.
The 5:2 Diet: Fast on 2 out of every 7 days. On fasting days eat 500–600 calories.
The 16/8 method: Fast for 16 hours and eat only during an 8-hour window. For most people, the 8-hour window would be around noon to 8 p.m. A study on this method found that eating during a restricted period resulted in the participants consuming fewer calories and losing weight.
It is best to adopt a healthy eating pattern on non-fasting days and to avoid over-eating.
If someone wants to lose weight, they should be aware of everything that they eat and drink each day. The most effective way to do this is to log every item that they consume, in either a journal or an online food tracker.
Mindful eating is a practice where people pay attention to how and where they eat food. This practice can enable people to enjoy the food they eat and maintain a healthy weight
As most people lead busy lives, they often tend to eat quickly on the run, in the car, working at their desks, and watching TV. As a result, many people are barely aware of the food they are eating.
Techniques for mindful eating include:
Sitting down to eat, preferably at a table: Pay attention to the food and enjoy the experience.
Avoiding distractions while eating: Do not turn on the TV, or a laptop or phone.
Eating slowly: Take time to chew and savor the food. This technique helps with weight loss, as it gives a person’s brain enough time to recognize the signals that they are full, which can help to prevent over-eating.
Making considered food choices: Choose foods that are full of nourishing nutrients and those that will satisfy for hours rather than minutes.
Protein can regulate appetite hormones to help people feel full. This is mostly due to a decrease in the hunger hormone ghrelin and a rise in the satiety hormones peptide YY, GLP-1, and cholecystokinin
 on young adults has also demonstrated that the hormonal effects of eating a high-protein breakfast can last for several hours.
Good choices for a high-protein breakfast include eggs, oats, nuts.
The Western diet is increasingly high in added sugars, and this has definite links to obesity, even when the sugar occurs in beverages rather than food.
Refined carbohydrates are heavily processed foods that no longer contain fiber and other nutrients. These include white rice, bread, and pasta.
These foods are quick to digest, and they convert to glucose rapidly.
Excess glucose enters the blood and provokes the hormone insulin, which promotes fat storage in the adipose tissue. This contributes to weight gain.
Where possible, people should swap processed and sugary foods for more healthful options. Good food swaps include:
whole-grain rice, bread, and pasta instead of the white versions
fruit, nuts, and seeds instead of high-sugar snacks
herb teas and fruit-infused water instead of high-sugar sodas
smoothies with water or milk instead of fruit juice
Dietary fiber describes plant-based carbohydrates that it is not possible to digest in the small intestine, unlike sugar and starch. Including plenty of fiber in the diet can increase the feeling of fullness, potentially leading to weight loss.
Fiber-rich foods include:
whole-grain breakfast cereals, whole-wheat pasta, whole-grain bread, oats, barley, and rye
fruit and vegetables
peas, beans, and pulses
nuts and seeds
One emerging area of research is focusing on the role of bacteria in the gut on weight management.
The human gut hosts a vast number and variety of microorganisms, including around 37 trillion bacteria
Every individual has different varieties and amounts of bacteria in their gut. Some types can increase the amount of energy that the person harvests from food, leading to fat deposition and weight gain.
Some foods can increase the number of good bacteria in the gut, including:
A wide variety of plants: Increasing the number of fruits, vegetables, and grains in the diet will result in an increased fiber uptake and a more diverse set of gut bacteria. People should try to ensure that vegetables and other plant-based foods comprise 75 percent of their meal.
Fermented foods: These enhance the function of good bacteria while inhibiting the growth of bad bacteria. Sauerkraut, kimchi, kefir, yogurt, tempeh, and miso all contain good amounts of probiotics, which help to increase good bacteria. Researchers have studied kimchi widely, and study results suggest that it has anti-obesity effects. Similarly, studies have shown that kefir may help to promote weight loss in overweight women.
Prebiotic foods: These stimulate the growth and activity of some of the good bacteria that aid weight control. Prebiotic fiber occurs in many fruits and vegetables, especially chicory root, artichoke, onion, garlic, asparagus, leeks, banana, and avocado. It is also in grains, such as oats and barley.
Numerous studies have shown that getting less than 5–6 hours of sleep per night is associated with increased incidence of obesity. There are several reasons behind this that insufficient or poor-quality sleep slows down the process in which the body converts calories to energy, called metabolism. When metabolism is less effective, the body may store unused energy as fat. In addition, poor sleep can increase the production of insulin and cortisol which also prompt fat storage.
How long someone sleeps also affects the regulation of the appetite-controlling hormones leptin and ghrelin. Leptin sends signals of fullness to the brain.
Stress triggers the release of hormones such as adrenaline and cortisol, which initially decrease the appetite as part of the body’s fight or flight response.
However, when people are under constant stress, cortisol can remain in the bloodstream for longer, which will increase their appetite and potentially lead to them eating more.Â
Cortisol signals the need to replenish the body’s nutritional stores from the preferred source of fuel, which is carbohydrate.
Insulin then transports the sugar from carbohydrates from the blood to the muscles and brain. If the individual does not use this sugar in fight or flight, the body will store it as fat, Implementing an 8-week stress-management intervention program resulted in significant reduction in the body mass index (BMI) of children and adolescents who are overweight or have obesity.
Some methods of managing stress include:
yoga, meditation, or tai chi
breathing and relaxation techniques
spending some time outdoors, for example walking or gardening
It is important to remember that there are no quick fixes when it comes to weight loss.
The best way to reach and maintain a healthy weight is to eat a nutritious, balanced diet.
This should include 10 portions of fruit and vegetables, good-quality protein, and whole-grains. It is also beneficial to exercise for at least 30 minutes every day.
A person who is underweight is likely to experience health issues, including:
infertility
developmental delays
a weakened immune system
osteoporosis
an increased risk of complication during surgery
malnutrition
While gaining weight can be a struggle, the following foods may help. They can also increase muscle and boost overall health.
The following nutrient-rich foods can help a person to gain weight safely and effectively.
1. Milk
Protein shakes can help people gain weight easily and are most effective if drunk shortly after a workout.
Milk offers a mix of fat, carbohydrates, and proteins.
It is also an excellent source of vitamins and minerals, including calcium.
The protein content of milk makes it a good choice for people trying to build muscle.
One study found that after a resistance training workout, drinking skim milk helped to build muscle more effectively than a soy-based product.
A similar study involving women in resistance training showed improved results in those who drank milk following a workout.
For anyone looking to gain weight, milk can be added to the diet throughout the day.
2. Protein shakes
Protein shakes can help a person to gain weight easily and efficiently. A shake is most effective at helping to build muscle if drunk shortly after a workout.
However, it is important to note that pre-made shakes often contain extra sugar and other additives that should be avoided. Check labels carefully.
3. Rice
A cup of rice contains about 200 calories, and it is also a good source of carbohydrates, which contribute to weight gain. Many people find it easy to incorporate rice into meals containing proteins and vegetables.
4. Red meat
Consuming red meat has been shown to help with building muscle and gaining weight.
Steak contains both leucine and creatine, nutrients that play a significant role in boosting muscle mass. Steak and other red meats contain both protein and fat, which promote weight gain.
While a person is advised to limit their intake, leaner cuts of red meat are healthier for the heart than fattier cuts.
One study found that adding lean red meat to the diets of 100 women aged 60–90 helped them to gain weight and increase strength by 18 percent while undergoing resistance training.
5. Nuts and nut butter
Consuming nuts regularly can help a person to gain weight safely. Nuts are a great snack and can be added to many meals, including salads. Raw or dry roasted nuts have the most health benefits.
Nut butters made without added sugar or hydrogenated oils can also help. The only ingredient in these butters should be the nuts themselves.
6. Whole-grain breads
These breads contain complex carbohydrates, which can promote weight gain. Some also contain seeds, which provide added benefits.
7. Other starches
Starches help some of the foods already listed to boost muscle growth and weight gain. They add bulk to meals and boost the number of calories consumed.
Other foods rich in starches include:
potatoes
corn
quinoa
buckwheat
beans
squash
oats
legumes
winter root vegetables
sweet potatoes
pasta
whole-grain cereals
whole-grain breads
cereal bars
Beyond adding calories, starches provide energy in the form of glucose. Glucose is stored in the body as glycogen. Research indicates that glycogen can improve performance and energy during exercise.
8. Protein supplements
Athletes looking to gain weight often use protein supplements to boost muscle mass, in combination with resistance training.
Protein supplements are available for purchase online. They may be an inexpensive way to consume more calories and gain weight.
9. Salmon
Six ounces of salmon will contain about 240 calories and salmon is also rich in healthy fats, making it a good choice for those looking to gain weight.
It also contains many nutrients, including omega-3 and protein.
10. Dried fruits
Dried fruits are rich in nutrients and calories, with one-quarter cup of dried cranberries containing around 130 calories
Many people prefer dried pineapple, cherries, or apples. Dried fruit is widely available online, or a person can dry fresh fruit at home.
11. Avocados
Avocados are rich in calories and fat, as well as some vitamins and minerals.
12. Dark chocolate
Dark chocolate is a high fat, high-calorie food. It also contains antioxidants.
A person looking to gain weight should select chocolate that has a cacao content of at least 70 percent.
13. Cereal bars
Cereal bars can offer the vitamin and mineral content of cereal in a more convenient form.
A person should look for bars that contain whole grains, nuts, and fruits.
Avoid those that contain excessive amounts of sugar.
14. Whole-grain cereals
Many cereals are fortified with vitamins and minerals.
However, some contain a lot of sugar and few complex carbohydrates. These should be avoided.
Instead, select cereals that contain whole grains and nuts. These contain healthy levels of carbohydrates and calories, as well as nutrients such as fiber and antioxidants.
15. Eggs
Eggs are a good source of protein, healthy fat, and other nutrients. Most nutrients are contained in the yolk.
16. Fats and oils
Oils, such as those derived from olives and avocados, contribute calories and heart-healthy unsaturated fats. A tablespoon of olive oil will contain about 120 calories
17. Cheese
Cheese is good source of fat, protein, calcium, and calories. A person looking to gain weight should select full-fat cheeses.
18. Yogurt
Full-fat yogurt can also provide protein and nutrients. Avoid flavored yogurts and those with lower fat contents, as they often contain added sugars.
A person may wish to flavor their yogurt with fruit or nuts.
19. Pasta
Pasta can provide a calorically dense and carbohydrate-rich path to healthy weight gain.
Avoid bleached pastas, and opt for those made with whole grains.
The foods above can help a person to increase their calorie intake in a healthy way. This will help a person to gain weight safely and efficiently.