Why Fat Is Not the Enemy: The Truth About Fats for Your Body and Brain

Wendy Francis, NBC-HWC – Board-Certified Health Coach and Functional Nutritionist

Last month, we talked about the truth behind “no fat” and “low fat” foods and why they are often far from healthy. Today, we’re taking it a step further.

Let’s clear something up right away. Fat is not the problem. In fact, fat is essential for your body, your brain, and your overall health.

If anything, most people are not eating enough of the right fats or are still stuck in outdated thinking that fat should be avoided.

Why Your Body Needs Fat

Fat is not just a source of calories. It plays a critical role in almost every system in your body.

• Supports hormone production
• Helps absorb fat-soluble vitamins (A, D, E, K)
• Provides long-lasting energy
• Protects your organs
• Keeps your skin and hair healthy

When you remove fat from your diet, your body does not function as efficiently. This can lead to fatigue, cravings, hormone imbalances, and even mood changes.

Your Brain Runs on Fat

This is where things get really interesting.

Your brain is made up of nearly 60 percent fat. That means the quality of fat you eat directly affects how your brain performs.

• Supports memory and cognitive function
• Helps stabilize mood
• Supports focus and mental clarity
• Protects against cognitive decline

Healthy fats, especially omega-3 fatty acids, help build and maintain brain cells. Without them, your brain simply cannot operate at its best.

Why You Should Include Fat at Every Meal

One of the biggest mistakes people make is eating meals that are high in carbohydrates but very low in fat.

When you add healthy fats to your meals, several powerful things happen:

• You stay full longer
• Your blood sugar stays more stable
• You reduce cravings later in the day
• You improve nutrient absorption

Fat slows down digestion just enough to give your body steady energy instead of quick spikes and crashes.

This is especially important for brain health because those blood sugar swings directly affect your mood, focus, and decision-making.

How Much Fat Should You Be Eating?

While individual needs vary, a general guideline is that fats should make up about 25 to 35 percent of your daily calories.

A simpler way to think about it is this:

• Add a healthy fat source to each meal
• Aim for balance, not restriction
• Focus on quality over quantity

Examples of healthy fats to include:

• Avocado
• Olive oil
• Nuts and seeds
• Grass-fed butter or ghee
• Fatty fish like salmon and sardines

Not All Fats Are Created Equal

It is important to note that while healthy fats are essential, not all fats support your health in the same way.

Fats to limit:

• Highly processed seed oils
• Artificial trans fats
• Ultra-processed packaged foods

These types of fats can increase inflammation in the body and negatively impact both physical and cognitive health over time.

The Bottom Line

Fat is not something to fear. It is something to understand and use to your advantage.

When you choose the right fats and include them consistently, you support your body, stabilize your energy, and fuel your brain in a powerful way.

If you are still reaching for low fat options thinking they are healthier, it may be time to rethink that approach.

Your brain and body will thank you.

Disclaimer

This content is for educational purposes only and is not intended to diagnose, treat, or replace medical advice. Always consult with your healthcare provider before making dietary or lifestyle changes.

Sources

Harvard T.H. Chan School of Public Health National Institutes of Health Journal of Lipid Research American Heart Association