Consider Ayat 154, Surat Baqra..

As-Salaam alaikum,
In this ayat, Allah Ta'ala says:--

"And say not of those who are slain in the Way of Allah: 'they are dead'.
Nay, they are living, though you perceive it not." (2:154)

This ayat/verse is explained by/in Hadith (as reported in Abu Dawud, Kitab Jihad), wherein the Prophet, Sallallahu alaihi Wasallam, said:--

"When you brothers from Uhud were touched (by death), Allah placed their
spirits in a green bird that drinks from the rivers of Paradise, eats its fruits
and rests near golden candles hanging in the shadows of the Throne.

When they saw that their food, drink and resting places were good, they said:
'Who will let our brothers know that we are alive in Paradise, and that we receive
our sustenance, but they may not skimp in the struggle, and that they do not
abdicate in the war? Allah, Subhanahu Wa Ta'ala, said: 'I will let them know.'
And it was then that Allah brought down this ayat: "And say not of those who are slain in....(2:154)

In any case, if our rationale for life is that we eat and move around, they also eat. Whatever you eat of grain, fruit or meat is a product of dust; you consume dust, they consume Noor... Divine Light.