What is meant by "Luqaymat" (morsels) in the noble Hadith: "Sufficient for the Son of Adam are a few morsels that keep his back straight," and what is the minimum limit for these morsels? And does a person's energy capacity vary such that this Hadith cannot be generalized?

What is required to be consumed of food is that which preserves a Muslim's strength and empowers him to obey Allah, because a strong believer is better and more beloved to Allah than a weak believer. A Muslim is not obligated to abstain from food or reduce it if that leads to his weakness and lack of concentration. Rather, he should be moderate and avoid extravagance.