This is absolutely not 'debunked'.
Taken from wikipedia entry on Protein Digestibility Corrected Amino Acid Score [1]:
- Chicken has a PDCAAS of 0.95
- Soy has a PDCAAS of 0.92
- Black beans have a PDCAAS of 0.74 (highest legume)
- Other beans and legumes have a PDCAAS of 0.70
- Wheat (seitan) has a PDCAAS of 0.42
Facts:
Soy has good enough nutrients to make a valid claims for it without throwing away valid science.
Soy is not surpassing chicken breast in PDCAAS, or red meat.
Eggs and dairy literally break the scale and are by far the highest ranking whole foods on a PDCAAS basis.
Seitan and beans are terrible in comparison in terms of PDCAAS, with you needing to consume nearly 2x the amount of protein from the former to compete with the later.
Opinions:
As far as fat goes, keep in mind tofu has a 1:2 fat:protein ratio. Chicken breast is 1:20+. This reason is the reason a lot of people herald chicken breast
Overconsumption of soy can lead to health implications
Soy does not have enough leucine to trigger the MTOR pathways to build muscle. If you are having soy post workout, you need to consume 45-60g of protein, vs just 20-30g of protein from animal products
Red meat has literally everything you need to live. Throw in a little carbs and fiber too and you can run at peak performance without worrying about anything in your diet.
Biases:
I've been relentless about my diet for 10 years and have tried everything. This includes vegan, vegetarian, keto, carb cycling, protein sparring modified fasts, you name it.
This year I started eating an animal based diet and not only do I feel great, my TDEE went from 2400 to over 3700. This means while I used to eat 2400kCal to maintain my weight, I now have to eat 3700 to maintain my weight, and I feel fantastic while doing so.
[1] https://en.wikipedia.org/wiki/Protein_Digestibility_Correcte...