The short version
Phosphorus builds bone and tooth mineral, forms part of every cell's DNA and RNA, and powers ATP, the molecule cells actually spend as energy. Getting too little of it is not the story here. If anything, the population data run the other way.
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Most Americans consume more than the recommended amounts of phosphorus.
Average adult intake in national surveys runs from about 1,189 to 1,744 mg a day against a 700 mg RDA, and that is before counting the processed-food additives discussed below.
It's everywhere on a plant plate
NIH's own list names legumes, nuts, vegetables and grains right alongside dairy, meat, fish and eggs.
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Many different types of foods contain phosphorus, including dairy products, meats and poultry, fish, eggs, nuts, legumes, vegetables, and grains
Half a cup of lentils supplies 178 mg, a quarter of the RDA from one spoonful of a pantry staple, and cashews, potatoes, kidney beans, brown rice and oatmeal all add meaningful amounts on top.
The bioavailability twist
Not all of that phosphorus counts equally, and this is where the real nuance sits.
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phosphorus from animal sources has a higher absorption rate than that from plants
The reason traces back to how plants store the mineral in the first place.
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phosphorus in seeds and unleavened breads is in the form of phytic acid, the storage form of phosphorus
Human intestines lack the enzyme that breaks down phytate-bound phosphorus, so a meaningful share of what a nutrition label counts in beans, grains and seeds simply passes through unabsorbed. Set against a population that already eats more phosphorus than it needs, that is closer to a mild buffer than a shortfall.
The hidden load isn't from produce
The bigger phosphorus story in the American diet is not whole food at all.
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Phosphate additives are estimated to contribute 300 to 1,000 mg to total daily phosphorus intakes
Those additives, used to preserve moisture and stabilize processed and frozen foods, concentrate in processed meat, cheese, cola and packaged bakery goods rather than in whole plant foods, so a diet built around beans, grains and vegetables tends to carry less of this specific load, on top of the phytate discount above.
Deficiency is not the risk
Actual phosphorus deficiency looks nothing like a dietary gap.
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Phosphorus deficiency (hypophosphatemia) is rare in the United States and is almost never the result of low dietary intakes
Where clinicians do restrict phosphorus, it is almost always for chronic kidney disease, and the guidance leans toward plants rather than away from them.
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replacing most animal proteins in their diets with plant-based protein sources, whose phosphorus is less bioavailable
That guidance is specific to advanced kidney disease and belongs with a treating clinician, not general advice. But it underlines the same point running through this page: plant-sourced phosphorus is the gentler version of a mineral most people already get plenty of.