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Warning: The Truth About Grain-Fed Beef and Your Heart

Dr. Gundry here with something special for you: a tasty, simple, and healthy recipe right out of my book “Dr. Gundry’s Diet Evolution.”

Today’s recipe features one of my very favorite proteins: steak.

Surprised? I get it. Many of my patients were shocked to hear a cardiologist recommending a steak recipe!

But the fact is, lean beef can be a wonderful source of protein when eaten in moderation and when you stick to my two simple rules…

Rule #1: Eat only the correct serving size.

This is easy. A serving of meat — whether it’s beef, lamb or fish — should be no more than 4 oz (about the size of the palm of your hand). You can also get more protein from vegetables high in protein.

Rule #2: Eat only grass-fed beef.

Grass-fed cows
Grass-fed beef has a perfect, balanced ratio of omega-6 fats to omega-3 fats.

For most of human history, our ancestors only ate beef from animals raised on grass. Why? Because cows are designed to eat grass.

But over the past 100 years, there’s been a major shift in our diet — and we’re just now starting to feel the impact of it. “Big Agriculture” started feeding livestock with grains to save money and increase production, but we’re the ones paying the price with our health.

Here’s why this change has been so harmful…

Grass-fed beef has a natural, balanced ratio of omega-6 fats to omega-3 fats — the ratio is about 3:1, which is perfect.

But when your ratio is any higher than 4:1, you start getting serious health problems: heart disease, hypertension, arthritis, and more.

And the fact is, modern grain-fed beef can have a ratio of 20:1 or even higher! Grain-fed beef is deficient in healthy omega-3s but it’s loaded with omega-6s, which are extremely unhealthy at these high levels.

Grass-fed beef is healthier, it’s leaner, and it tastes better. I tell my patients to switch to grass-fed beef exclusively.

However, it is more expensive than grain-fed beef… and that’s where my recipe today for Chipotle Flank Steak comes in handy. Flank steak is as tasty and tender as a ribeye or strip steak, but often a third of the price – or even less.

And by adding one tenderizing ingredient to the marinade — goat’s milk yogurt — you’ll end up with the most succulent flank steak you’ve ever eaten.

[Note: If you’re not a big fan of beef, you should STILL save this recipe. The marinade is great on chicken, salmon, and grilled veggies, too.]

Steak Ingredients


  • 3 Tablespoons extra virgin olive oil
  • 3 Tablespoons lime juice
  • Zest of one lime
  • 1 Tablespoon Dijon mustard
  • 1 garlic clove, minced
  • 1 teaspoon ground cumin
  • 1 tablespoon sauce from canned chipotles en adobo
    OR 1 tablespoon pure chile powder
  • 1 cup plain goat’s milk yogurt
  • 1 grass fed flank steak (about 1 ¼ pounds)
  • Sea salt to taste


  1. Combine all ingredients except the steak and sea salt in a resealable zip-top plastic bag. Seal bag and shake to mix well.
  2. Add steak and press air out of the bag, making sure the meat is well coated in marinade. Let marinate AT LEAST one hour, or as long as 8.
  3. Preheat a grill or skillet over high heat.
  4. Remove steak from marinade, pat dry, and sprinkle with salt.
  5. Grill to desired doneness — medium rare is about 4 minutes per side — and let rest for 5 minutes before serving.
  6. Slice steak against the grain into thin, diagonal slices. Serve 4 oz of meat per person.

And there’s your steak! Now, the best thing about this particular recipe is its versatility.

Since you’re making a larger piece to start, you’re sure to have plenty of leftovers… and since this recipe tastes good hot OR cold, it’s as nice on a salad as it is hot.

For Dinner:
For a simple weeknight meal, I love to serve my steak over a bed of riced cauliflower, along with grilled asparagus (with a healthy drizzle of olive oil, of course!)

Or if I’m in the mood for something decadent, I make two of my favorite steakhouse sides:

1. Creamed Spinach: sauté spinach with garlic until wilted then remove from heat and stir in cream cheese, salt and pepper, and a dash of nutmeg for the EASIEST creamed spinach.

2. Mashed “Potatoes”: steam cauliflower, then mash with sour cream and grated parmesan.

For Lunch:
There’s a reason you see some variation of a steak salad on almost EVERY restaurant menu: it’s a classic.

My favorite steak salad features peppery arugula, shaved pecorino cheese (just a little bit), pickled red onion, and a sprinkle of parsley.

After all, when you’re starting with a perfectly cooked steak, it doesn’t take much to make a fantastic salad.

And I keep the dressing simple too — just a mixture of red wine vinegar, lemon, and extra virgin olive oil.

[TIP: If you’re packing this salad to go, put the dressing, steak, onion and cheese on the BOTTOM of your container. Then top off with the arugula. When you tip your salad out onto a plate, you’ll have a perfectly dressed salad, without soggy greens.]

Now, before I sign off… I’ve got one question for you:

In your opinion, what’s the hardest part about trying to eat healthy?

Leave your answer in the comment section below. I’ll read through your answers and come up with easy solutions for the most common problems — so make sure to comment below and give me your input!

Looking out for you

Steven Gundry, MD

Steven Gundry, MD

P.S. If you like this blog and think your friends might appreciate it, too – please share it on Facebook or other social media. Just look for the “SHARE” buttons at the top and bottom of the page! Thanks again and I look forward to seeing your comment below answering the question: What’s the hardest thing about eating healthy for you?

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