People always get the quantity wrong with protein.
NHS minimum recommended amount of daily protein for a man is 80g, that's equivalent to 4 chicken breasts a day, it's 60g for a woman. You can't get anything like that quantity, from nuts and beans.
If you're active, play sport, etc, then it's more like you'll need 100-120g a day, that's a lot of chicken!
It fascinates me that in a nation with a visible and rapidly growing (literally and metaphorically) issue with excess, when diet is discussed a few people always bring up deficiencies.
I've personally only ever met one person with a serious protein deficiency - a vegetarian who didn't like vegetables so usually defaulted to crisps and chocolate. Regular minor deficiencies are easily remedied, unlike the products of excess - heard disease, diabetes, strokes etc.
Anyone who is genuinely interested should take a look at the Blue Zones - an insight to the world's healthiest & longest-lived communities.
Very rapid summary: There differences & there are similarities.
Differences:
- Some drink alcohol some don't. (those that do do so in moderation, nearly always accompanying a meal)
- Poetically, the 3 most healthy and long-lived - one is vegan, one veggie and one meat-eating. However meat is eaten in moderation, as a component of a meal when it is available.
Similarities:
- All would classify as poor. (properly poor, not can't afford a new iPhone poor)
- All eat what is available & in season - except for easily stored staples like rice and pulses.
- All eat communally - whether extended family or the local community.
- All are 'busy', by which I mean they are up and about. They don't work out or go to the gym, they just stay busy.
I don't recall any mention of deficiencies.