It has been scientifically proven that fast eating and not chewing your food properly is one of the causes of weight gain. In a research by the North American Association for the Study of Obesity showed that overweight men and women took in fewer calories when they slowed their normal eating pace.  Chewing food helps digest food thereby working on weight gain aspect. Consider this natural tip to include in your lifestyle. Chewing food helps digest food thereby working on weight gain aspect.
As far as studies on it go, here are some that I mentioned in The Everyday Roots Book. In 2002 the Journal of Nutrition concluded that it can aid weight loss when used in place of long chain triglycerides. It was also shown to strongly curb appetite and it appeared to increase the burning of calories. In 2003 Obesity Research found that it may help burn calories, probably due to the fact that it boosted energy. In 2010 the International Journal of Food Sciences and Nutrition also found that it could help boost metabolism and reduce appetite.
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.
Fathi, Y., Faghih, S., Zibaeenezhad, M. J., & Tabatabaei, S. H. (2016, February). Kefir drink leads to a similar weight loss, compared with milk, in a dairy-rich non-energy-restricted diet in overweight or obese premenopausal women: A randomized controlled trial. European Journal of Nutrition, 55(1), 295–304. Retrieved from https://link.springer.com/article/10.1007/s00394-015-0846-9
At the beginning of my newsletter on healthy weight loss, I mentioned that the top rated diet according to Consumer Reports is Volumetrics . Well, Volumetrics is essentially a rephrasing of Joel Fuhrman's "nutrient density" concept. In this case, I think something is lost in the translation. Dr. Fuhrman's idea is that you eat foods that contain the greatest concentration of nutrients with the lowest number of calories. The Volumetrics plan rephrases that idea to say that you want to eat food that provides the highest amount of volume with the lowest number of calories. These ideas are close, and overlap in many areas, but are ultimately very different when it comes to day-to-day application. Volumetrics leads you to foods filled with lots of water and fiber—not unhealthy, but...Dr. Fuhrman's Eat to Live plan leads you to cruciferous vegetables and antioxidant rich berries. Words matter—stick to fruits and vegetables.
Pay attention to seasonal fruits and vegetables, and pounce on the asparagus when it comes along. Asparagus is nutrient dense and, like apples, contains a lot of fiber to help curb appetite. It also contains a host of vitamins that work together to metabolize blood glucose, therefore regulate blood sugar. If you find yourself feeling puffy or bloated, asparagus is a mild diuretic that can help reduce bloating and leave you feeling your best. Try eating asparagus steamed on the side of your favorite dishes-this vegetable doesn’t need much to make it taste good
Breaking your fast every morning after 7-8 hours of good night sleep is extremely important. Your brain controls all the body functions, and if you do not provide the cells the food to carry out the biological reactions to create energy, your brain will not function properly. This, in turn, will lead to lethargy, slow metabolism, weight gain, hampered cognitive functions, etc. So, never skip your breakfast. Eat oatmeal, milk, egg, spinach smoothie, fruits, etc to fill your tummy for at least 2 hours. You will feel more energetic and will be able to concentrate better.
In a study published in the Journal of Nutrition, one group of volunteers were given a meal of chicken with vegetables along with a glass of water. Another were given the same ingredients served as a blended soup. At intervals over the next 3 hours both groups were asked to rate their sense of fullness on a scale from one-to-ten. The soup group felt significantly less hungry.
In one study, scientists assessed the effect of drinking water by measuring subjects’ oxygen uptake and carbon dioxide production in a respiratory chamber. They found that 500 ml of water increased metabolic rate by 30% in both men and women. The effect was sustained for over an hour. The researchers estimate that increasing water consumption by 1.5 liters daily would result in a loss of 17,400 calories or 5.3 lbs. of body fat over the course of a year.
Fruits, in general, are high in fiber and nutrients, and eating a few servings every day can help you lose weight, according to a study done by the Federation of American Societies for Experimental Biology. Researchers found that people who ate at least one apple a day lost more weight than those who skipped fruit. Steal these 12 diet secrets from people who’ve maintained their weight loss.
One study from the University of Adelaide in Australia suggests you may lose more weight when you work out towards the end of your menstrual cycle, as opposed to right when a new one begins. That’s because the hormones estrogen and progesterone tell your body to use fat as an energy source. "Women burned about 30 percent more fat for the two weeks following ovulation to about two days before menstruation," study author Leanne Redman says.
Protein is the most satiating of the macronutrients, meaning that it will keep you feeling full longer than either fats or carbohydrates, Dr. Apovian says. If you want to drop pounds you’ve got to eat more protein while cutting calories. Her favorite way: a delicious protein smoothie. You can add spinach, yogurt, berries, milk, or a host of other healthy options. Or try these 15 weight-loss smoothies that will help you slim down.
Try intermittent fasting. Intermittent fasting (or IF) has gotten trendy over the last few years thanks to mainstream wellness pushes like the Bulletproof Diet. The concept: Stave off food for 12 to 18 hours between dinner and breakfast, as doing so may offer many of the same benefits of a low-calorie diet, like a lower incidence of cardiovascular diseases. Couple it with high-intensity exercise and Dr. Gottfried says you're looking at a winning combo.