They want to reduce fat and calories.
They don’t like excess grease pooling in the dish.
👉 Why many don’t rinse:
Rinsing can splash hot fat around, which is a burn risk.
It washes away flavor (since seasonings and browned bits go down the drain).
It can clog drains with cooled fat.
If you prefer leaner meat, a common alternative is to:
Drain off the fat with a spoon or by carefully tilting the pan.
Start with leaner ground beef (90% or 93% lean).
So, your mother-in-law isn’t doing anything unsafe by skipping the rinse—she’s just cooking the way many people do.
