"I had my tears. From here we learn that crying satiates a person and he does not feel like eating. And similarly, Elkanah said to Hannah (1 Samuel 1:8) 'Why do you weep?' And he said to her (1 Samuel 1:8) 'Why do you not eat?' From here we learn that crying satiates. Therefore, "I had my tears for bread" (Lamentations 1:16) - this I will remember and pour out my soul within me. I remember what You did to our forefathers in the desert when they said (Exodus 32:4) 'These are your gods, O Israel.' And I remember and pour out my soul within me. Another explanation: I remember what Moses said (Numbers 29:39) 'These you shall offer to the Lord at your set feasts.'"...
Hannah in the Days of Moses
Midrash Tehillim 42:2