From المِقدامِ بنِ مَعْدِ يكَرِبَ, the Prophet (SAW) says:
مَا مَلأَ آدَمِيٌّ وِعَاءً شَرًّا مِنْ بَطْنٍ، بِحَسْبِ ابْنِ آدَمَ أكَلاَتٌ يُقِمْنَ صُلْبَهُ، فَإِنْ كَانَ لاَ مَحَالَةَ، فَثُلُثٌ لِطَعَامِهِ، وَثُلُثٌ لِشَرَابِهِ، وَثُلُثٌ لِنَفَسِهِ
“There is no worse vessel for the son of Adam to fill than his stomach. A few mouthfuls is enough for the son of Adam to keep his back straight. If he has no way [but to fill it] then allow one-third for food, one-third for drink, and one-third for air.”
– al-Tirmidzi, Ahmad, Ibn Majah, al-Hakim
Yes, you can stand up straight with just a few mouthfuls. How apt, especially in this current economic situation.