Healthy Oils and Fats: Fuel for Your Hormones and Brain

I (Jen) vividly remember growing up in the 90s, when TV commercials proudly announced the arrival of a “revolutionary, heart-healthy oil” on grocery store shelves. The message was clear: for the sake of our health, it was time to ditch vegetable oil and embrace the new, improved canola oil. These ads convinced me so strongly that I immediately urged my mom to make the switch. Later, when I moved out on my own, I avoided vegetable oil like the plague and stocked my kitchen exclusively with canola oil. After all, I wanted to make the healthiest choices possible!

Looking back, it’s clear how easy it is to be swayed by marketing. The truth is, not all fats are created equal. While healthy oils and fats are essential for hormone balance and brain health, many processed seed oils-including canola oil-can actually do more harm than good. It’s a reminder that sometimes, the “healthiest” option isn’t always what it seems.

Why Healthy Oils and Fats Matter

Healthy fats are not the enemy.
They are essential messengers, stabilizers, and builders in the body.

When it comes to hormone health and cortisol balance, fats aren’t optional — they are foundational.

Hormone Production

Fats are the building blocks for hormones. Cholesterol (yes, the right kind) is the raw material your body uses to produce steroid hormones like:

• Progesterone
• Estrogen
• Testosterone
• Cortisol

Without enough healthy fats, your body can’t manufacture hormones efficiently.

When cortisol is chronically elevated due to stress, the body prioritizes survival hormones over reproductive hormones. This can contribute to low progesterone, irregular cycles, poor sleep, and mood instability.

Adequate healthy fats signal safety to the body.
Safety lowers stress signaling.
Lower stress allows hormone production to normalize.

Healthy fats don’t just build hormones — they help regulate the stress response that influences them.

Cortisol & Blood Sugar Stability

One of the most overlooked roles of dietary fat is blood sugar regulation.

When meals lack adequate fat and protein, blood sugar spikes and crashes. Those crashes trigger cortisol release to bring blood sugar back up.

Over time, this creates a rollercoaster:

Spike → Crash → Cortisol surge → Fatigue → Cravings → Repeat.

Including healthy fats in meals:

• Slows glucose absorption
• Prevents sharp blood sugar drops
• Reduces unnecessary cortisol spikes
• Supports steady energy throughout the day

Stable blood sugar is one of the simplest ways to calm cortisol naturally.

Brain & Nervous System Health

About 60% of your brain is made of fat. Healthy fats — especially omega-3s — support:

• Memory
• Focus
• Emotional regulation
• Mood stability

Omega-3 fatty acids (found in fish, walnuts, flax, and chia) help reduce neuroinflammation and support healthy cortisol signaling.

Monounsaturated fats like those in olive oil improve circulation to the brain and help protect nerve tissue.

When your nervous system is inflamed, cortisol rises.
When your brain is nourished, stress resilience improves.

Fats literally insulate your nervous system.

Cell Function & Communication

Every cell membrane in your body is built from fat. That includes:

• Brain cells
• Hormone receptor sites
• Nerve tissue
• Ovarian cells
• Adrenal cells

If the fats in your diet are damaged or inflammatory, your cell membranes become less flexible and less responsive.

That means hormone signals don’t transmit as efficiently.

Healthy fats improve cellular communication — which improves how well your hormones actually work once they’re produced.

The Problem with Seed Oils

Seed oils (like soybean, corn, canola, and sunflower oil) are everywhere in processed foods. Here’s why they’re a concern— especially for cortisol and hormone health:

High in Omega-6

Seed oils are packed with omega-6 fatty acids. While we need some omega-6, the modern Western diet contains far too much relative to omega-3s.

This imbalance promotes systemic inflammation.

Inflammation is interpreted by the body as stress.
Stress elevates cortisol.
Chronically elevated cortisol disrupts progesterone and thyroid balance.

Excess omega-6 intake can contribute to:

• Hormone imbalances
• Mood instability
• Weight gain (especially in the midsection)
• Increased stress reactivity

Highly Processed

Many seed oils are extracted using high heat, chemical solvents, and deodorizing processes.

These methods:

• Damage the fatty acids
• Create unstable compounds
• Increase oxidative stress in the body

Oxidative stress further strains the nervous system and increases inflammatory signaling — which again raises cortisol.

Linked to Chronic Disease

Excess omega-6 combined with low omega-3 intake increases inflammatory load. Chronic inflammation is a root contributor to:

• Cardiovascular disease
• Insulin resistance
• Brain fog
• Hormone imbalance
• Anxiety and depression

For women trying to regulate cortisol and balance hormones, reducing inflammatory oils is a powerful first step.

Best Healthy Oils and Fats for Your Body and Brain

• Extra Virgin Olive Oil: Rich in monounsaturated fats and antioxidants, olive oil supports brain health and lowers dementia risk.
• Avocados and Nuts: Packed with healthy fats, fiber, and nutrients for your brain and hormones.
• Fatty Fish (like salmon): High in omega-3s, which are essential for brain function and mood regulation.
• Coconut Oil: Contains medium-chain triglycerides (MCTs) that provide quick energy for your brain.

Bottom Line on Healthy Oils

Healthy fats are essential for hormone production and brain health. Focus on whole-food sources like olive oil, avocados, nuts, and fatty fish. Limit your intake of processed seed oils found in packaged and fried foods, as they often contain high levels of omega-6, promote inflammation, and contribute to chronic disease. 

When you remove inflammatory seed oils and replace them with whole-food sources of healthy fats, you reduce inflammatory signaling and create a more stable internal environment.

Balanced fats → stable blood sugar → calmer cortisol → healthier hormones.

You don’t have to remove everything overnight.

But if you start with the things you use every single day, you create real change quickly.

One of the easiest swaps? Homemade mayonnaise.