Cooking oil is a staple in most kitchens, but not all oils are created equal. Choosing the wrong oil can turn your recipe into a toxic meal. If you’re shopping at Costco, knowing which oils are worth adding to your cart and which ones should stay on the shelf is important. Here’s a closer look at what Costco offers regarding cooking oils and some guidance to help you make the healthiest choices for your pantry.
Marianne’s Avocado Oil: A Solid but Imperfect Choice
Avocado oil is a great option for cooking, thanks to its high smoke point and heart-healthy fats. Marianne’s Avocado Oil is made from one ingredient—100% avocados—which is a good start. However, it’s not certified organic, meaning the avocados may have been exposed to pesticides or other chemicals during cultivation.
The packaging is another drawback. While the bottle is labeled BPA-free, it’s still made of plastic, which can leach other harmful chemicals, especially when exposed to heat or light. These toxins may contribute to hormone disruption, inflammation, and long-term health risks like c*ncer.
This avocado oil is still a better choice than industrial seed oils like corn or canola oil, which are highly processed, inflammatory, and often rancid before they even reach the shelf. If you need cooking oil with a high smoking point and can’t find a better alternative, Marianne’s Avocado Oil is a decent option—but it’s not perfect.
Kirkland’s Signature Olive Oil: One to Avoid
Olive oil is often praised for its health benefits, but not all are worth buying. Kirkland’s Signature Olive Oil falls into this category. The problem? It’s a blend of refined olive oils with only 15% extra virgin olive oil, and the sources are unspecified. This raises concerns about purity, age, and whether the oil has already oxidized when it hits the shelf.
To retain its health benefits, olive oil must be 100% pure, extra virgin, cold-pressed, and ideally organic. It should also be stored in a dark glass bottle to protect it from light and heat. Unfortunately, Kirkland’s Signature Olive Oil checks none of these boxes. If you’re serious about cooking with quality oils, leave this one on the shelf.
Kirkland’s Organic Olive Oil: A Step in the Right Direction
Kirkland’s Organic Olive Oil is a much better option than its Signature counterpart. This is certified organic, sourced from Mediterranean olives, and traceable—a good sign for purity and freshness.
However, like Marianne’s Avocado Oil, it’s packaged in plastic. While this is less than ideal, the organic certification and traceability make it a more reliable choice for those seeking a healthier olive oil option. Always store oils in a cool, dark place for optimal quality to prevent oxidation and degradation.
Why the Right Oil Matters
The oils you cook with have a significant impact on your health. Many conventional oils, especially industrial seed oils like canola and corn, are highly processed, unstable, and prone to oxidation. This can lead to inflammation, oxidative stress, and long-term health risks.
By choosing oils that are minimally processed, organic, and stored in safe packaging, you can reduce your exposure to harmful toxins and support your overall health. While Costco offers some decent options, it’s important to weigh the pros and cons of each product to ensure you’re making the best choice for your kitchen.
Making the Healthiest Choice
When shopping at Costco, consider your priorities. If organic and traceable oils in glass bottles aren’t available, choose the next best: oils with simple ingredients, organic certification, and minimal processing. Marianne’s Avocado Oil and Kirkland’s Organic Olive Oil are steps in the right direction, but they’re not perfect.
Ultimately, the goal is to reduce exposure to harmful additives and packaging toxins while cooking with oils that support your health. Next time you’re at Costco, consider these tips and prioritize quality over convenience. Your body will thank you for it.
