Over the past several decades, obesity rates in America have reached alarming levels, becoming one of the most pressing public health issues in the country.

According to the Centers for Disease Control and Prevention (CDC), over 42% of American adults are now classified as obese — a staggering figure that underscores the growing health crisis. This rise in obesity has been linked to an increase in chronic diseases, including heart disease, diabetes, and certain types of cancer, as well as mental health challenges like depression and anxiety.

While many factors contribute to obesity rates, the most effective solutions are a calorie-controlled, healthy diet and consistent physical activity. Regular exercise, particularly strength training and cardiovascular workouts at the gym, can play a significant role in weight management, improving overall health, and reducing the risk of chronic diseases. In this blog, we’ll explore the current state of obesity in America, the root causes behind the obesity epidemic, and how gym exercise can be a powerful tool for overcoming obesity and achieving better health.

The Prevalence of Obesity and the Role of Gym Exercise

The rise in obesity rates has mirrored significant shifts in American society, including increased consumption of processed foods, more sedentary lifestyles, and greater levels of stress. The problem is not only affecting adults but also younger populations, with childhood obesity rates climbing rapidly over the past two decades.

Exercise, particularly structured workouts at the gym, provides a direct path to improving body composition, enhancing metabolic health, and reversing many of the negative effects of obesity. AFAC gym in Thornton, Colorado, offers a wide range of fitness opportunities, including weightlifting, cardio machines, group classes, and personal training—allowing individuals to find a workout routine that suits their preferences and physical condition. Beyond weight loss, exercise promotes mental clarity, improves mood, and boosts overall energy levels, creating a positive cycle that supports long-term health improvements.

The Rate of Obesity in America

Obesity rates in the United States have been climbing steadily for decades. According to the CDC:

42.4% of American adults were considered obese in 2017–2018, up from 30.5% in 1999–2000.
Approximately 9.2% of American adults have severe obesity (BMI of 40 or higher).
20.7% of children and adolescents aged 6 to 19 are classified as obese.

If these trends continue, it’s estimated that by 2050, more than 260 million Americans—including over half of all children and adolescents—will be overweight or obese. This increase will put immense pressure on the healthcare system, leading to higher rates of chronic diseases, mental health issues, and economic burdens.

What Is BMI and How Is It Calculated?

Body Mass Index (BMI) is the most commonly used method to classify weight status and obesity levels. It’s a simple calculation based on a person’s height and weight:

BMI = weight (in pounds) × 703 divided by height (in inches) squared

If you don’t feel like doing math, you can use one of many online calculators to easily see your BMI.

The World Health Organization (WHO) defines BMI categories as follows.

Underweight: BMI < 18.5
Normal weight: BMI 18.5–24.9
Overweight: BMI 25–29.9
Obese: BMI ≥ 30
Severely Obese: BMI ≥ 40

BMI provides a quick and easy way to screen for weight-related health risks, but it has significant flaws when used to assess individual health.

The Flaws of BMI When Measuring Obesity

While BMI is widely used to assess obesity rates, it’s a flawed measurement for several reasons.

BMI Doesn’t Measure Body Composition – BMI does not differentiate between fat mass and muscle mass. A person with a high percentage of muscle may have a BMI that classifies them as overweight or obese, despite having low body fat and being in excellent health.
BMI Ignores Fat Distribution – BMI does not account for where fat is stored in the body. Visceral fat (around the organs) is far more dangerous than subcutaneous fat (under the skin).
BMI Is Not Suitable for All Populations – BMI calculations can overestimate obesity in athletes and underestimate it in older adults with lower muscle mass.

A more accurate measure of obesity would involve assessing body fat percentage, muscle mass, and waist-to-hip ratio—factors that provide a clearer picture of an individual’s health and fitness level.

InBody 770 at AFAC Gym – Better than BMI

While BMI (Body Mass Index) is a quick and easy way to estimate body fat based on height and weight, it has some serious limitations. BMI doesn’t account for muscle mass, fat distribution, or overall body composition — meaning that someone with a high level of muscle could be classified as overweight or obese even if they have low body fat and excellent health.

At AFAC gym, we take a more precise and informative approach to measuring health and fitness. Our gym is equipped with the InBody 770 body composition analyzer — one of the most advanced tools available for assessing body composition. In just one minute, the InBody 770 provides a detailed breakdown of your body’s key components, including:

Muscle Mass – Understand how much lean muscle you have and where it’s distributed in your body.
Fat Mass – Get an accurate measurement of your body fat percentage and where it’s stored.
Water Content – Measure how much water is inside and outside your cells, helping to identify hydration levels and potential inflammation.
Minerals – Track bone mineral density and overall skeletal health.

The InBody 770 gives you a clear, comprehensive view of your body’s makeup — far beyond what BMI can provide. Best of all, you can save and compare your readings over time, giving you real, measurable proof of the progress you’re making with your workouts and fitness classes at AFAC. Whether you’re looking to lose weight, gain muscle, or simply improve your overall health, the InBody 770 helps you set smarter goals and stay motivated.

Tracking your body composition with the InBody 770 allows you to focus on meaningful improvements rather than just numbers on the scale. Talk to any member of the AFAC team to learn how our InBody 770 can help you transform your fitness journey!

What’s Causing High Obesity Rates in America?

The obesity epidemic in America is driven by a combination of environmental, social, and behavioral factors, including:

Poor Diet Choices – Fast food, processed snacks, and sugar-laden beverages have become staples in the American diet. These foods are high in calories, low in nutrients, and highly addictive.
Sedentary Lifestyles – The rise in desk jobs, increased screen time, and fewer opportunities for physical activity have contributed to reduced calorie expenditure.
Portion Sizes – Restaurant and packaged food portion sizes in America are significantly larger than in other countries, leading to overconsumption.
Stress and Sleep Deprivation – Chronic stress and poor sleep patterns disrupt hormones that regulate hunger and metabolism, leading to increased cravings and weight gain.
Socioeconomic Barriers – Low-income communities often have limited access to healthy food options and safe spaces for exercise, contributing to higher obesity rates.

What Are the Health Risks of Obesity?

Obesity is not just a cosmetic issue — it’s a major health concern with serious long-term consequences, including:

Type 2 Diabetes – Excess fat interferes with insulin regulation, leading to insulin resistance and increased blood sugar levels.
Cardiovascular Disease – Obesity increases the risk of high blood pressure, high cholesterol, and heart disease.
Stroke – The combination of high blood pressure and poor cardiovascular health increases the risk of stroke.
Cancer – Obesity has been linked to increased risks of several cancers, including breast, colon, and pancreatic cancer.
Mental Health Issues – Obesity is associated with higher rates of depression, anxiety, and body image disorders.
Premature Death – The risk of early mortality increases significantly with higher levels of obesity.

The economic cost of obesity is equally concerning, with obesity-related healthcare costs in the U.S. estimated at $173 billion annually.

What Are Some Ways to Conquer Obesity?

Although obesity is a complex issue, the most effective strategies for weight loss and management remain simple:

1. Healthy Diet

Focus on whole, nutrient-dense foods like fruits, vegetables, lean proteins, and whole grains.
Limit processed foods, added sugars, and high-calorie beverages.
Practice portion control and mindful eating to reduce overeating.

2. Regular Gym Exercise

Strength Training – Builds muscle, increases metabolic rate, and improves body composition.
Cardio Workouts – Improves heart health, burns calories, and reduces fat.
High-Intensity Interval Training (HIIT) – Maximizes calorie burn and improves metabolic health in less time.
Group Classes – Boost motivation and provide social support for long-term adherence.

3. Lifestyle Changes

Improve sleep quality and manage stress through mindfulness or meditation.
Increase daily physical activity by walking more, taking the stairs, and reducing sedentary time.
Seek support from healthcare professionals or personal trainers for guidance and accountability.

Fight Back Against Obesity – One AFAC Gym Session at a Time

America’s obesity epidemic is a complex and challenging issue — but it’s not insurmountable. By combining improved dietary habits with regular gym exercise, individuals can regain control over their weight and overall health. AFAC gym offers a structured, supportive environment where people can work toward their fitness goals while improving their physical and mental health. Investing in your health today can prevent the chronic diseases of tomorrow—one workout at a time.

Are you searching for a gym where you can reap all the benefits exercise has to offer? Visit AFAC gym today to speak to our team about our affordable memberships. AFAC gym is committed to supporting your health and wellness efforts, so you’ll see the results you’re working so hard for. That’s why we were voted the best gym in Thornton, Colorado, and have hundreds of 5-star reviews.

To learn more about our top-rated gym and our incredible array of strength training and cardio equipment — as well as our unique offerings and amenities like daily group classes, cryotherapy, InBody 770 assessments, hydro massage, and our rock climbing wall and cave — we hope you will contact us or visit for a personalized tour. Our team will be happy to help you. For more information and assistance, you can also contact our gym owner, Susan, at 720-849-0245 or susan@adventurefitness.club.