You aren't the first person I met that said they grew more muscle/got stronger when consuming beef, as opposed to consuming chicken. I don't have good sources for this, so take it with a grain of sea salt, but a pound of beef has 2grams of creatine, while chicken contains very little. That could have something to do with it.
Better yet, it's likely the fat in the beef that's giving you the most benefit. Beef has a type of saturated fat called stearic acid in it that helps to boost testosterone levels. Grass fed beef would be the best call here, as it has a better fat profile overall, including higher levels of stearic acid. If you continue to consume grain fed, then you'll likely be best served eating the leaner cuts of beef.
Beef also has more cholesterol in it than chicken, and this could also benefit you in the muscle/strength department.
So...for building muscle/strength, I'd give the nod to beef over chicken thanks to the creatine, fat, and cholesterol content.
But wait...tuna has beneficial fats in it too, you say? The beneficial omega 3's in tuna have anti-inflammatory effects associated with them. This is great for the prevention of a lot of ills, but unfortunately, just like taking anti-inflammatory medicines (aspirin, ibuprofen, etc.) while trying to build muscle, there is concern that this anti-inflammatory effect can disrupt the process of building muscle. Fish oil inhibits the type of prostaglandins the body produces that are pro inflammatory. Beef, whole eggs, and milk have the opposite effect.
My advice would be to consider beef, whole eggs, and milk products while pursuing lean gains and strength, but switch to fish containing the beneficial omega 3's while cutting fat and retaining muscle.
Alternatively, you could continue the beef while in a cutting phase, but really, it's probably a good idea to cycle your foods to keep the body from adapting to the same diet.
Back to chicken...I've really never considered plain chicken breasts anything other than an anti-catabolic (muscle sparing) protein. There's nothing particularly anabolic (muscle building) about it. If someone is opposed to the taste of fish, like me, then replacing actual fish with chicken and fish oil capsules while on a cutting phase would be making some good use of chicken.
I know, I know...the magazines are full of diet plans of professional bodybuilders that include copious amounts of chicken breasts in their diets and these guys are all huge, right? Yes, and if someone is injecting testosterone into their system, then they can and should feel free to substitute chicken over beef, as well. They're getting all the help they need; they don't need the anabolic properties of diet like us mortals, nor should we emulate their nutrition.
Welcome to the site. Hope you find it useful.
MM


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