What should I plan for the menu when eating out or having gatherings?

It's hard to keep refusing gatherings while on a diet.

I can't just stop eating because I'm on a diet.

I also feel like people are whispering that I'm making a fuss for no reason.

I have another gathering on Saturday, so I'm not eating dinner.

It is quite a predicament for me.

I can't just drink water while everyone else is busy eating and talking.

What should I do about my diet?

I'm also worried that I might lose control after having one.

Have a great day, everyone.