A reference on phosphorus and the role the EU confirms in the normal function of the cell membrane — with examples from cell biology and the full wording in the Guide.
Continue to the GuideEvery cell in the body needs a boundary tight enough to separate its interior from its surroundings, yet permeable enough to let specific substances in or out on purpose. That job falls to a wafer-thin shell made of fat molecules, with individual proteins embedded in it: the cell membrane.
A large share of these fat molecules carry a phosphate group at one end — a compound of phosphorus and oxygen that behaves differently in a watery environment than the rest of the same molecule, which repels water. That dual nature is what produces the orderly arrangement visible under a microscope as a double layer.
For phosphorus, there is an authorized statement in this area, one the European Food Safety Authority (EFSA) reviewed and the European Commission subsequently authorized. The card in the next section shows the exact wording.
Phosphorus is a macromineral the body cannot produce on its own and has to take in regularly through food. Part of it sits bound in phosphate groups that form part of the fat molecules making up the cell membrane.
EU-authorized wording · Regulation (EU) No 432/2012
The official sentence itself stays deliberately brief. The three sections below place, in scientific context, exactly where phosphorus shows up within this shell — without being part of the reviewed wording themselves.
A single fat molecule in the membrane consists of a small backbone carrying two long fatty acid chains on one side and a phosphate group on the other. The fatty acid chains avoid water, while the phosphate group attracts it. Because of this, millions of such molecules arrange themselves, without outside direction, into two facing layers whose water-averse ends meet in the middle.
Not every fat molecule in the membrane has the same shape. In some, the phosphate group is noticeably small relative to the fatty acid chains, which gives the molecule more of a cone-like shape. When many cone-shaped molecules cluster in the same spot, they nudge the surface into a slight curve — an effect visible, for instance, in the folded inner membrane of mitochondria.
If a cell's outer shell briefly tears open from mechanical force, that state doesn't last: small vesicles filled with fat molecules travel from inside the cell to the damaged spot and fuse with the existing shell there, closing the gap again within a short time.
The official wording itself is limited to a single, generally phrased sentence: “Phosphorus contributes to normal function of cell membranes.” EU-authorized wording · Regulation (EU) No 432/2012. The three sections above place the finding in scientific context; they are not themselves part of this statement.
The digital Portrait expands on every section of this page and adds two things more: a source table, plus the official text quoted end to end.
One-time access · Digital information product
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