The truth about fat: Why your body needs it to stay fit

For decades, fat has been misunderstood—blamed for weight gain, demonized in diets, and stripped from countless foods in the name of health. But the truth is more nuanced. Your body not only uses fat—it relies on it to function, thrive, and stay fit.

As a doctor, nutritionist, and sports trainer, I’ve seen firsthand how the fear of fat can derail fitness goals, hormonal balance, and even mental well-being. It’s time to shift the narrative and understand why fat is not your enemy—it’s your ally.

Not all fat is created equal

To understand fat’s role, we need to distinguish between types of fat—both in the foods we eat and in the body. Dietary fats include saturated, unsaturated, and trans fats. Unsaturated fats (found in foods like olive oil, avocados, and fatty fish) support heart health, brain function, and reduce inflammation.

Saturated fats, when consumed in moderation from quality sources like eggs or grass-fed dairy, can be part of a balanced diet. Trans fats, however, are best avoided due to their link with cardiovascular disease and systemic inflammation.

In the body, we have essential fat, which is necessary for survival, and storage fat, which serves as an energy reserve. Too little body fat can disrupt hormones, impair recovery, and weaken immunity—just as too much can stress the cardiovascular and metabolic systems.

The power of fat in your physiology

Fat plays a vital role in the body beyond just stored energy. It is essential for producing hormones, supporting the nervous system, and helping your body absorb fat-soluble vitamins like A, D, E, and K.

Without enough dietary fat, the body struggles to regulate mood, maintain skin elasticity, or balance reproductive health. This is especially important for women, whose hormonal cycles depend heavily on adequate fat intake.

Why low-fat diets can backfire

In the pursuit of leanness or weight loss, many people turn to low-fat or fat-free diets. But these approaches often lead to fatigue, poor concentration, and stalled progress. Fat helps stabilize blood sugar, supports satiety, and provides long-burning fuel—especially important during workouts or long days of activity.

In athletes, particularly women, chronically low body fat can lead to hormonal dysregulation, missed periods, bone density loss, and increased injury risk. Fat is not a flaw in your fitness—it’s a foundation.

Fat and fitness: a surprising synergy

When the right kinds of fats are included in a balanced diet, they can support endurance, post-workout recovery, and even body composition. Dietary fats help reduce exercise-induced inflammation and improve joint mobility, allowing for consistent training and quicker recovery.

Additionally, fat provides a long-lasting source of energy during moderate-intensity workouts such as long runs, cycling, or hiking. Incorporating healthy fats into pre- or post-workout meals can improve energy levels and reduce muscle soreness.

How to include fat without fear

The key to incorporating fat in a healthy, fitness-supportive way is choosing quality sources and proper portions. Focus on whole-food fats such as:

• Avocados – rich in monounsaturated fats and fiber • Fatty fish like salmon or mackerel – packed with omega-3s • Nuts and seeds – portable sources of protein and healthy fat • Extra virgin olive oil – ideal for dressings and cooking • Pasture-raised eggs – a complete nutrient-dense option

Pair these fats with protein and complex carbohydrates to build balanced meals that fuel workouts and daily life. Rather than counting grams, focus on how you feel—satiated, focused, and energized.

Fat is not just necessary—it’s essential. It supports everything from your cells to your workouts, from your mood to your metabolism. Demonizing fat or cutting it out entirely may do more harm than good.

Embrace the truth about fat: when chosen wisely and used intentionally, it can become one of your greatest allies in the journey to lifelong fitness and wellness.