Popular diets, often referred to as fad diets, make promises of weight loss or other health advantages such as longer life without backing by solid science, and in many cases are characterized by highly restrictive or unusual food choices.[23]:296[39] Celebrity endorsements (including celebrity doctors) are frequently associated with popular diets, and the individuals who develop and promote these programs often profit handsomely.[22]:11–12[40]
The basic principles of good diets are so simple that I can summarize them in just ten words: eat less, move more, eat lots of fruits and vegetables. For additional clarification, a five-word modifier helps: go easy on junk foods. Follow these precepts and you will go a long way toward preventing the major diseases of our overfed society—coronary heart disease, certain cancers, diabetes, stroke, osteoporosis, and a host of others.... These precepts constitute the bottom line of what seem to be the far more complicated dietary recommendations of many health organizations and national and international governments—the forty-one “key recommendations” of the 2005 Dietary Guidelines, for example. ... Although you may feel as though advice about nutrition is constantly changing, the basic ideas behind my four precepts have not changed in half a century. And they leave plenty of room for enjoying the pleasures of food.[23]:22
That means one drink a day for women, two a day for men. People over 65 should drink even less. A drink is defined as 12 ounces of beer, 5 ounces of wine, or 1½ ounces of 80-proof spirits. While alcohol has potential heart benefits, it poses a variety of health risks, especially in excess amounts. And some people shouldn't drink at all, including pregnant women and those taking medications that interact with alcohol. People with liver disease, high trigylcerides, sleep apnea, and certain other conditions should ask their doctors about the advisability of drinking.
Developing healthy eating habits isn’t as confusing or as restrictive as many people imagine. The essential steps are to eat mostly foods derived from plants—vegetables, fruits, whole grains, legumes (such as beans and lentils), and nuts—and limit highly processed foods. If you eat animal foods, you can add in some dairy products, fish, poultry, and lean meat. Studies show that people who eat this way have a reduced risk of heart disease, diabetes, and possibly cancer and other chronic diseases. Here are our guidelines for building a healthy diet.
A fat-burning superfood, grapefruit contains a compound that can lower the fat-storage hormone insulin, which in turn can lead to weight loss. In fact, eating half a grapefruit before each meal could help you lose up to a pound a week—even if you don't change anything else about your diet. Because grapefruits are 90% water, which fills you up, they also act as a natural appetite suppressant.

Coconut oil may be high in saturated fat, but that doesn’t mean you should write it off completely, especially when it comes to weight loss. In fact, a study of 30 men published in Pharmacology found that just two tablespoons per day reduced waist circumference by an average of 1.1 inches over the course of a month. What’s more? At roughly 117 calories per tablespoon, coconut oil (which has a versatile high smoke point) is an ideal cooking companion so long as you don’t use it every day and rotate in other cooking oils such as heart-healthy EVOO.
A great source of calcium and important cancer-fighting compounds, broccoli also has loads of filling fiber and will set you back only 30 calories per serving. If eating this cruciferous veggie makes you bloat, try steaming it first, which makes it easier to digest while still preserving the cancer-fighting ingredients that could be lost when you boil or cook it in the microwave.

Salmon boasts significant anti-inflammatory properties thanks to its rich omega-3 fatty acid content, meaning it’s an excellent source of protein for those looking to jumpstart their weight loss. In fact, one International Journal of Obesity study that examined the effects of weight loss and seafood consumption showed that when men ate three 5-ounce servings of salmon per week for a month as part of a low-calorie diet, it resulted in approximately 2.2 pounds more weight loss than following an equicaloric diet that didn’t include fish. According to a study published in The Journal of Nutritional Biochemistry, fishy fatty acids may also signal thyroid cells in the liver to burn more fat.
The average American consumes approximately 15.5 pounds of pasta each year—and most of it is the refined white stuff. Unfortunately, this type of noodle is usually void of fiber and micronutrients. Spaghetti squash, on the other hand, boasts only about 40 calories per cup—more than 75 percent fewer calories than a cup of plain pasta—and is an excellent source of vitamin A and potassium. Make this simple swap to jumpstart your weight loss and you’ll be fitting into your skinny jeans in no time! For more swaps to save you calories, don’t miss these food swaps that cut calories.
Since avocados are packed with nutrients and healthy fats that can stimulate weight loss, it’s no surprise that avocado oil acts in a similar fashion. When Penn State University researchers compared those who consumed monounsaturated-rich oils (like high-oleic canola oil or avocado oil) with those who consumed a flax-safflower oil blend, they found that those who used just three tablespoons of the monounsaturated-rich oil daily lost nearly two percent of their belly fat in just one month.
You may not think of them as a weight-loss food, but eggs are packed with protein, which helps curb your appetite. One study found that overweight women who ate eggs for breakfast were able to lose twice as much weight as women who started their days with bagels. And egg whites in particular are a good source of branched-chain amino acids, which help keep your metabolism running smoothly.
While we’re on the subject of water, why not throw a few lemon slices into the hydrating and satiating beverage? In addition to adding a pop of color and flavor to a tall glass of H2O, lemon can also help encourage weight loss. Just one of the bright citrus fruits contains an entire day’s worth of vitamin C, a nutrient that has the power to reduce levels of a stress hormone called cortisol that triggers hunger and fat storage. Additionally, lemons also contain polyphenols, which researchers say may ward off fat accumulation and weight gain.
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