Should You Worry About Seed Oils?

You’ve seen the headlines. You’ve scrolled past those scary videos late at night. Seed oils are “toxic.” They’re “poisoning” you. 

They cause everything from brain fog to cancer. And now you’re standing in your kitchen, staring at that bottle of canola oil, wondering if it’s been slowly harming you this whole time.

I get it. I really do.

As The Oncology Dietitian, I hear these fears every single day. My clients come to me overwhelmed by all the conflicting information out there, terrified they’ve been doing everything wrong. 

So here’s what I want you to know right now: seed oils are not something you need to fear after cancer.

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Why Seed Oils Became So Controversial

Some wellness personalities suggested switching to beef tallow or coconut oil instead which is not a good choice because it’s high in saturated fat..

And honestly? The fear spread fast.

Here’s the thing. Cancer survivors already carry so much anxiety around food choices. When you’ve been through treatment, every bite feels loaded with meaning. 

You want to do everything right. So when someone online says seed oils are dangerous, that fear hits differently.

As The Oncology Dietitian, I’ve watched this misinformation cause real stress for people who are already dealing with so much. 

One of my clients from The NED Method Membership told me she threw away every bottle of oil in her pantry after watching a viral video. She was terrified she’d been hurting herself for years.

That kind of fear isn’t helpful. It’s harmful. And it’s not based on good science.

Do Seed Oils Cause Inflammation?

Nope. They don’t.

This is one of the biggest myths I address, so let’s clear it up right now. Critics claim that omega-6 fatty acids in seed oils promote chronic inflammation in your body. But when you actually look at the research? It doesn’t hold up.

Here’s what truly causes inflammation: excess body fat tissue, alcohol, and tobacco.

That’s the list. Foods don’t cause inflammation the way social media suggests. The word “inflammation” has become this buzzword that gets thrown around without any precision. 

Yes, your body experiences normal inflammation during digestion and healing. That’s healthy and normal. The concern is chronic, excessive inflammation, and seed oils don’t create that.

What About Omega-6 Fatty Acids?

Omega-6 fatty acids are essential fats your body cannot make on its own. You have to get them from food. Linoleic acid, the main omega-6 in seed oils, actually plays important roles in keeping you healthy.

Now, some people raise concerns about the ratio of omega-6 to omega-3 fats in our diet. And yes, it’s true that most of us could benefit from eating more anti-inflammatory foods rich in omega-3s like fatty fish, walnuts, and flaxseed oil.

But here’s what people get wrong: that doesn’t mean omega-6 fats are harmful.

Your body needs both omega-3 and omega-6 fats. The solution isn’t to eliminate omega-6s from your life. It’s simply to add more omega-3s through foods like salmon, chia seeds, and flaxseeds. See the difference?

Do Seed Oils Cause Cancer?

No. And this is really important for every cancer survivor to understand.

According research, the only diet-related factors with strong evidence for increasing cancer risk are:

• Processed meats like bacon, hot dogs, and deli meats (linked to colorectal cancer)
• Alcohol (increases risk of seven cancers including breast, liver, and stomach)
• High-sodium diets over extended periods (linked to stomach cancer)
• Low-fiber diets (getting less than 30 grams daily increases risk)

There is no credible evidence linking seed oil consumption to cancer development. 

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Common Seed Oil Myths Debunked

Let’s tackle the big ones I hear all the time.

“I Feel Better After Cutting Out Seed Oils”

I hear this a lot. And here’s what’s actually happening.

You probably feel better because you changed your overall eating pattern, not because you removed seed oils specifically. Think about it. When people eliminate seed oils, they typically cut out fast food, fried foods, and packaged snacks at the same time.

Those foods are often higher in calories, sodium, and added sugars. They’re also really easy to overeat. The improvement you’re noticing? It comes from eating more whole foods and cooking at home more often.

One of my survivors shared that she felt amazing after “quitting” seed oils. But when we looked closer at what actually changed, she’d also stopped eating fast food three times a week and started cooking at home most nights. That’s what made the difference. Not the oil.

“Seed Oils Contain Dangerous Chemical Solvents”

I understand why this one sounds scary. Yes, some seed oils are extracted using hexane as a solvent. But here’s what you need to know: the refining process removes virtually all of it from the final product.

Hexane evaporates during processing. The amount remaining in refined oil is far below any safety threshold. You’d have to consume an impossible amount of oil daily to reach levels of concern.

But if this still worries you? Cold-pressed or expeller-pressed oils skip the solvent process entirely. Extra-virgin olive oil and avocado oil are mechanically pressed options you can use instead.

“Canola Oil Was Used as Jet Fuel”

Yes, many plant oils can be converted into biofuel. But that has absolutely nothing to do with food safety.

Canola oil can be processed into biodiesel, just like soybean oil and other vegetable oils. Industrial applications and food safety are completely separate things. 

We don’t judge a food’s safety based on what else it might be used for, right?

This argument sounds alarming at first, but it falls apart under any logical examination.

What I Tell My Clients About Cooking Oils

Here’s the bottom line: use seed oils without fear. They’re perfectly fine for cooking, baking, and salad dressings.

As The Oncology Dietitian, here’s my practical guidance:

• Olive oil is excellent for medium-heat cooking and dressings
• Avocado oil works well for high-heat cooking like searing
• Canola oil is affordable and versatile for everyday cooking
• Sesame oil adds wonderful flavor to stir-fries and Asian dishes
• Sunflower oil and safflower oil are great for baking

The key is variety. No single oil is magic, and no single oil is poison. Choose based on flavor, smoke point, and what works for your recipe.

One of my clients told me after we worked together: “I stopped cutting out foods I love, and I feel healthier than ever.” That’s the freedom I want for you too. You can learn more about foods that don’t increase cancer risk and finally stop the constant second-guessing.

What Actually Matters for Cancer Prevention

Instead of worrying about seed oils, let’s focus on what the evidence actually supports. These are the changes that genuinely reduce cancer risk:

• Get enough fiber. Aim for 30 grams or more daily from fruits, vegetables, whole grains, beans, and legumes.
• Avoid alcohol. Any amount increases the risk of seven cancers. Zero is the safest amount.
• Avoid processed meats. Bacon, hot dogs, deli meats, and sausages are linked to colorectal cancer.
• Maintain a healthy weight. Excess body fat tissue is one of the primary drivers of chronic disease.
• Stay physically active. Movement supports your body in countless ways.
• Eat plenty of plants. Fill your plate with colorful fruits and vegetables.

This is what I teach through The Oncology Dietitian Plate Method. It’s based on guidance from the American Institute for Cancer Research and my years of working with cancer survivors.

When you focus on these fundamentals, you don’t have to stress about every single ingredient. You can actually enjoy food again. You can trust your choices. Another survivor shared with me: “For the first time, I know what’s true and what’s just noise.”

That clarity is possible for you too. And if the fear of recurrence keeps you up at night, know that obsessing over seed oils won’t help. But building sustainable, evidence-based habits absolutely will.

Finding Peace with Food After Cancer

You’ve been through enough. Treatment took so much from you. Now you’re trying to rebuild, to feel strong again, to trust your body. The last thing you need is another food fear stealing your peace.

Seed oils are not your enemy. They’re just one small part of a much bigger picture. What matters is the overall pattern of how you eat and live.

As The Oncology Dietitian, I’ve helped thousands of survivors move from confusion to confidence. From fear to freedom. From endless Googling to actually enjoying meals again.

You don’t have to figure this out alone. You don’t have to keep questioning every choice. And you definitely don’t have to throw away perfectly good cooking oil because of a viral video.

The path forward is simpler than the internet makes it seem. Focus on what the science supports. Let go of the myths. And trust that you’re capable of nourishing yourself well.

I believe in you.

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References

1. https://www.wcrf.org/about-us/news-and-blogs/are-seed-oils-good-or-bad-for-our-health/
2. https://www.wcrf.org/diet-activity-and-cancer/risk-factors/
3. https://mcpress.mayoclinic.org/nutrition-fitness/the-pros-and-cons-of-seed-oils-and-how-to-incorporate-them-in-your-diet/
4. https://www.aicr.org/cancer-prevention/recommendations/
5. https://www.cancer.org/cancer/risk-prevention/diet-physical-activity.html
6. https://www.mdanderson.org/publications/focused-on-health/eat-less-processed-meat.h17-1592991.html