Manava Dharmashastra 6.13

6.13

sthalajāni udakajāni adyāt | tathā puṣpamūlaphalāni ca |

He should eat the vegetables that grow on land and in water; also flowers, roots and fruits, the productions of pure trees; as well as oils produced from fruits.—(13).

Medhātithi’s commentary (manubhāṣya):
He should eat those growing on land and in water; as also flowers, roots and fruits.—(13).

This verse is quoted in Aparārka (p. 942);—and the second half in Mitākṣarā (on 3.49) to the effect that clarified butter and such ‘oils’ should not be used.

Comparative notes by various authors
Gautama (3.26).—‘The hermit shall live in the forest, subsisting on roots and fruits, practising austerities.’ Baudhāyana (2.11.15).—(See under 3.)

Āpastamba (2.22.2).—‘Then he shall wander about, sustaining his life by roots, fruits, leaves and grass.’

Do. (2.23.2).—‘Afterwards he shall wander about sustaining his life with roots, fruits, leaves and grass which he collects. Finally, he shall content himself with what has become detached spontaneously. Then he shall live on water, then on air, and then on Ākāśa. Each succeeding mode of subsistence procures greater rewards’

Vaśiṣṭha (9.4).—‘He shall only gather wild-growing fruits and roots.’

Viṣṇu (95.7-12).—‘He may eat flowers; he may eat fruits; he may eat vegetables; he may eat leaves; he may eat roots; or he may eat barley once a fortnight.’

Yājñavalkya (3.49).—‘He shall eat what ripens in its own time; and all rites prescribed by Śruti and Smṛti, he shall perform with oils extracted from fruits.’