Once you make the choice to reduce seed oils in your diet, dining in will be easier than dining out. Figuring out how to avoid seed oils at restaurants is far more challenging than doing it in your own kitchen, simply because you've lost control over the ingredients and preparation process. Seed oils such as canola, soybean, and combinations of vegetable oils are used extensively by most restaurants in many unexpected ways, including dressings, marinades, "grilled" vegetables, and even bread. In this article, I'll go through where seed oils are found on menus, how to get kitchens to meet your needs, and what to realistically expect so you actually know how to avoid seed oils at restaurants the next time you eat out.

Do Restaurants Commonly Use Seed Oils

Seed oils tend to be the default cooking oil in most restaurant kitchens owing to their affordability, neutrality in taste, and high smoke point, making them ideal for high-volume cooking. In his book, Dark Calories: How Vegetable Oils Destroy Our Health and How We Can Get It Back, Cate Shanahan, a board-certified family physician, states that "eliminating seed oils is one of the simplest and most impactful steps you can take to improve your health." 1 Although you may choose to disagree with the strong wording of the quote above, the bottom line remains the same: seed oils are more common in the restaurant industry than most people are aware, and hence the process of eliminating them is somewhat different than when you're at home.

Restaurant Foods Most Likely to Contain Added Oils

Obvious Sources

• Deep-fried foods: potato fries, chicken nuggets, tempura, onion rings

• Stir-fry meals and pan-fried foods

• Pan-seared meats, unless stated

Less Obvious Sources

• Salad dressings and vinaigrettes, even at more upscale restaurants, unless the menu states that they have olive oil

• Mayonnaise sauces such as tartar sauce, aioli, and regular mayonnaise, generally made with soybean or canola oil

• "Grilled" vegetables, which usually get coated with seed oils before being grilled

• Restaurant bread and baked products, since most restaurant breads contain vegetable oils or shortening

• Marinades, which are put on long before cooking and not listed on menus

Questions to Ask Your Server

Precision beats a general question every time. Instead of asking "do you use healthy oils?", try:

"Could you make this with olive oil or butter instead of vegetable oil?"

A few more tactics that make this easier:

• Call or email ahead for a special dinner or an unfamiliar restaurant, if that option exists

• Ask when it's not busy requests made outside the dinner rush get more attention

• Ask for sauces and dressings on the side, so you control how much goes on your food and can swap in olive oil or vinegar instead

What to Order Instead

Favor cooking techniques that use minimal oil to begin with grilling, steaming, or broiling since these pose less risk than frying, sautéing, or searing, and are also easier for a kitchen to prepare oil-free on request. Farm-to-table restaurants and places that advertise grass-fed, traditional, or "clean" cooking are your best bet if you eat out often, since butter, tallow, and olive oil tend to be their default fats already.

How to Avoid Seed Oils at Restaurants by Cuisine Type

Italian and Mediterranean — The easiest category. Olive oil is traditional and usually the default, though bread and cream sauces are still worth checking.

Steakhouses — Generally accommodating, since protein dishes are cooked fresh rather than pre-prepared. It's fairly simple to ask for your steak cooked in butter instead of seed oil.

Asian cuisine (Chinese, Thai, Vietnamese) — Typically more challenging, since high-heat frying with seed or vegetable oil is standard. Some kitchens can use avocado oil or reduce the amount on request.

Mexican and Latin American — Varies widely. Traditional cooking uses lard, but modern or casual spots often fry with seed oil instead. Worth asking directly about beans, rice, and anything fried.

Indian cuisine — Many dishes use ghee, which works in your favor, though some restaurants substitute vegetable oil to cut costs.

American casual and fast casual — The hardest category. Standardized corporate kitchens with a shared fryer offer the least flexibility.

What If the Restaurant Can't Tell You Which Oil They Use?

This happens often, especially at busy or corporate chains, and it's not worth turning into a standoff. When accommodation isn't realistic — a packed fast-casual spot, a work lunch, a large group — default to the simplest option on the menu: grilled rather than fried, sauce on the side or skipped, dressing swapped for oil and vinegar or lemon. One meal you can't fully control isn't worth stressing over; the research on seed oils concerns consistent, long-term intake, not a single dinner.

Is It Necessary to Avoid Seed Oils Completely?

No and this guide isn't arguing that you should. For the full picture of what the research actually shows about seed oils and health, including where mainstream nutrition science lands on the inflammation and heart-health questions, see our complete guide to seed oils and health. This article is about making eating out easier if you've already decided to cut back, not about relitigating whether you should.

Frequently Asked Questions

Is it realistic to completely avoid seed oils when eating out?

No, certainly not for everybody, not every single meal. Rather, it would be more feasible to try and minimize exposure as much as possible, because exposure occasionally isn’t the same as exposure every day.

What should I say to my server without sounding difficult?

Precision and politeness are better: "Would it be possible to use olive oil or butter instead of vegetable oil for this dish?" Employees usually react better to precise questions rather than explanations about your diet.

Are all fried foods automatically off-limits?

Fried foods in restaurants usually use seed oil, while the oil used for frying is frequently recycled, reducing its quality even more. Fried foods are normally the riskiest type of foods in a restaurant.

Do farm-to-table restaurants really use different oils?

Yes, indeed. When the restaurant uses traditional or "clean" cooking methods, there is a tendency for them to rely on olive oil or butter as their cooking medium.

Key Points

Seed oils remain the default in any commercial kitchen, and can be found in places besides those which are immediately apparent, such as fried foods, dressings, marinades, “grilled” vegetables, and bread. The most practical strategy is not about perfection but about asking questions, sticking to simple cooking techniques, visiting restaurants that use traditional oils for cooking, and understanding that an occasional indulgence is not worth stressing over. Whether you believe in the larger arguments surrounding seed oils or not, these steps will certainly help your dining experience.

Sources & Research Cited

1. Kosterina. "The Truth About Seed Oils in Restaurants," quoting Dr. Cate Shanahan, author of Dark Calories: How Vegetable Oils Destroy Our Health and How We Can Get It Back (Hachette Go, 2024). kosterina.com