Manuscript on dietetics, written in several instalments at at least two different periods of Linnaeus's life: in 1733, and after his return from the continent in 1738.
'Diaeta naturalis' owes a great deal to Linnaeus's tour of Lapland in 1732, where he observed the Lapps' healthier way of living, in an undisturbed natural environment.
The manuscript was started a year later for Linnaeus's private tuitions on dietetics and the natural way of living. 'Diaeta naturalis' was left unfinished.
The last stage of the manuscript can be dated from the beginning of the other manuscript on dietetics, 'Lachesis naturalis', which Linnaeus begun when he started lecturing on the subject. 'Lachesis naturalis' is mostly based on 'Diaeta naturalis', and consequently much of the contents in 'Diaeta' are crossed out, probably as Linnaeus copied the material into his 'Lachesis' manuscript.

Fol. 1v: dedication to Gustaf Cronhielm.

Fol. 3r: Full title:
Caroli Linnaei | Diaeta Naturalis | comprehensa | Regulis 70 [altered from 50] aphoristice cum scholiis & de|monstrationibus autopticis, et principis zoo|logicis deductis, composita; in qua hominem animal e[ss]e demonstratur & agnoscitur, eumq[ue] ani|malium more vivere debere doctus [crossed out, with 'probatur' superscript]; hinc | staturae na[tur]alis integritatis ejusque | rudera possibilia docantur. | ex principiis | zoologicis vario[rum] a[nim]alium | staticis Sanctorii, Keilli | oeconomicis, vario[rum] gentium | experimentali[bus] variorum [crossed out] hominum longaero[vum] | Naturali[bus] detectorum | mechanicis medicorum | Theologicis veteris & non testamenti"

f. 5: 'L.B.' Preface.

ff. 98-100: list if the 'Regulae aphoristice' numbered 1 to 73.