When this person is upset about her niece, she asks Reddit:
My SIL and she daughter are currently living with us. She is going through a nasty divorce. My niece is 19 She is also extremely overweight. Money is really tight for them so we buy most of the food for the house. I am a registered dietitian. I love all aspects of food and how it works with our bodies. I find it fascinating which is why I chose this work.
My husband and I are both very active and eat very healthy. Not in a diet culture/restrictive way, but we limit our processed foods, eat a ton of fruits and vegetables, make as much from scratch as we can, including bread and pasta. We also enjoy cooking together and learning about different foods and a lot of times we do say things to eachother like 'hey, did you know mangos are a great source of folate!' or 'I love that these stuffed mushrooms feel like they shouldn't be a healthy snack, but they are!'