For many years, experts have investigated the effects of low body fat on menstrual cycles in women. Some women with low body fat percentages report several irregularities, including infrequent periods, abnormally painful periods and even no period at all.

A common assumption is that vegans easily lose weight simply because they follow a diet free of fatty meat and dairy products. This couldn't be further from the truth for some vegans, however. You can either gain or lose weight on a vegan diet. As with any diet, it all depends on how many calories you consume.

Exercise science identifies three body types: ectomorph, endomorph and mesomorph. Ectomorphs are able to stay thin with little difficulty, even when trying to build muscle and mass. Endomorphs have the opposite problem: they gain muscle easily, but also tend to put on fat. Mesomorphs split the difference.

Belly fat loss for men is an admirable goal, as this can improve appearance and overall health. However, spot reduction, or fat loss from only one area of the body, is impossible. To get rid of belly fat and love handles, you must burn more calories than you consume.

There are a host of diet plans available claiming to promote rapid weight loss. A low-carb diet is a popular diet plan in which only 15 to 20 percent of your calories come from carbs and the rest come from fats and proteins.

The body mass index, or BMI, is commonly used in doctors' offices as a way to estimate your body fat level. It provides a quick and easy way to evaluate obesity trends in the general population, but the equation can overestimate or underestimate body fat levels in many people.

If you've ever been on a diet, you probably are familiar with the concept of your weight "set point." According to Mirror Mirror.org, your body's natural set point is the weight your body will seek to maintain, even when confronted with a low-calorie diet.

The bottom line when it comes to weight loss is to burn more calories than you consume each day. To lose 1 lb., you will have to burn 3,500 calories, which equates to 500 calories per day for a 1 lb. loss in a week.

Albolene has been around for decades as a makeup remover, but has been used by professional athletes, especially boxers, to meet their weigh-in requirements when a couple of pounds could mean disqualification from a bout.

Food nutrition labels help you buy and eat healthy foods. The U.S. Food and Drug Administration, or FDA, designed these labels to help you better understand a specific food's nutritional value compared to a consistent standard. Most labels compare the nutrition of the food to a standard 2,000-calorie diet.

Body Mass Index, or BMI, measures the relationship between a person’s height and weight. Your BMI indicates whether you are underweight, overweight, obese or at a healthy weight. You can use the same formula to calculate an infant’s BMI that you would use to calculate an adult’s BMI.

For better or worse, fasting has played an intrinsic role in various cultural, dietary and healing practices for centuries. Skinverse reports that short-term fasting is a natural aspect of healing, citing wounded animals that cease eating until their injuries have healed.