One verse

Bhagavad Gita 6.16

6.16

नात्यश्नतस्तु योगोऽस्ति न चैकान्तमनश्नतः | न चातिस्वप्नशीलस्य जाग्रतो नैव चार्जुन ||६-१६||

nātyaśnatastu yogo.asti na caikāntamanaśnataḥ . na cātisvapnaśīlasya jāgrato naiva cārjuna ||6-16||

aśnataḥ
of one who eats
tu
but
yogaḥ
linking with the Supreme
asti
there is
na
nor
ca
also
ekāntam
overly
anaśnataḥ
abstaining from eating
na
nor
ca
also
ati
too much
svapna-śīlasya
of one who sleeps
jāgrataḥ
or one who keeps night watch too much
na
not
eva
ever
ca
and
arjuna
O Arjuna

There is no possibility of one’s becoming a yogī, O Arjuna, if one eats too much or eats too little, sleeps too much or does not sleep enough.