Why are we so afraid to point out when people are eating too much or poorly?

When I was visiting my family in Peru my grandma and family always watched out for each other. If someone was eating too many of the unhealthy things or eating too much someone would lovingly mention it and/or give them some of the healthy food. My uncle calls his wife "gordita" which is like a cute way of saying "fatty." and she laughs calls him bandito. She is fat but she isn't concerned with it. I had gained a bit of weight and so when I went over there my grandma was like, "oh no you're fat! I'll make you some good healthy food." She'd mention it every now and then if my cousins or uncles/aunt called to ask how I was. I ended up losing a ton of weight and went back to my pre-finals weight and my confidence soared up! Even when she was calling me fat, it didn't effect me at all because she was doing it because she cared and not in a mean way. Also she stuffed me with healthy food and she was more mad that I wouldn't eat more lol.

My boyfriend and I will watch out for each other too. Like if he's on his 3rd bowl of ice cream I'll point it out and if I'm on my 3rd pizza slice he'd point it out. We exercise together and if I gain weight and ask him if it looks like I have he answers honestly.

I don't understand why we should lie to each other and beat around the bush. If you're around close friends/family/ SO shouldn't we watch out for each others' health and esp. if someone is becoming unhealthy? What do you guys think?
We should be more honest with the ones we love
We should let them be
We should say something if it gets really bad
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Why are we so afraid to point out when people are eating too much or poorly?
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