Your body can be considered a soft machine which also needs frequent sustenance.

"But even energy beings need sustenance of some sort."

She was a growing child, and she needed proper sustenance.

"I am, but I'm also eating, as my body needs sustenance after my long rest."

After his experiences on the plane he needed sustenance.

"I'll need sustenance if I'm to do good work in town tonight," he thought half aloud.

Remarkably fit, considering his age, but he desperately needs sustenance.

Your body will know when you need sustenance.

Data had told him humans needed sustenance to survive.

Picnics can be brought by those who need sustenance.