AITA for eating fatty foods in front of my MIL?

Living with extended family can sometimes turn everyday habits into unexpected sources of conflict. In this case, one woman simply tried to follow the diet recommended by her doctor to manage a health condition, but her mother-in-law had very different opinions about what healthy eating should look like.

The situation started when the mother-in-law moved in during the pandemic. At first, the arrangement seemed like a win for everyone involved. She wouldn’t have to live alone during lockdown, and the household gained another adult who could help with the kids. But over time, a disagreement about food and health turned family meals into a surprisingly tense part of the day.

‘AITA for eating fatty foods in front of my MIL?’

The original poster began by explaining why her mother-in-law had been living with them:

One of the biggest points of conflict revolves around the OP’s diet and health condition:

However, her mother-in-law sees things very differently:

Conflicts about food are surprisingly common in multi-generational households, especially when different generations grew up with very different nutritional advice. For many people who lived through the diet trends of the 1980s and 1990s, “fat” became almost synonymous with unhealthy eating. Grocery stores filled with low-fat products, and avoiding fat was widely promoted as the key to heart health.

Modern nutritional science, however, paints a more nuanced picture. Today, many experts distinguish between different types of fats and recognize that certain fats—like those found in eggs, nuts, fish, and dairy—can play an important role in a balanced diet. In fact, for some medical conditions, diets lower in carbohydrates can be recommended.

For individuals with Polycystic Ovary Syndrome (PCOS), insulin resistance is a common issue. Because carbohydrates have a significant impact on blood sugar levels, some endocrinologists recommend reducing carb intake to help manage insulin response. This approach can naturally result in a diet that appears higher in fat and protein compared to traditional dietary guidelines.

Dr. Walter Willett, a professor of epidemiology and nutrition at Harvard T.H. Chan School of Public Health, has noted that “the type of fat matters more than the total amount,” emphasizing that healthy fats can be part of a well-balanced diet when consumed appropriately.

Beyond nutrition itself, family dynamics often play a big role in these conflicts. Repeated criticism about someone’s eating habits can create tension and make shared meals uncomfortable. Experts in family communication often encourage addressing the behavior directly—making it clear that unsolicited comments about someone’s diet or body are unwelcome.

Here’s the comments of Reddit users:

Many commenters strongly supported the OP and felt the mother-in-law was crossing a line:

Some readers felt the bigger issue was actually the husband’s reaction:

Some commenters with medical backgrounds also weighed in:

Situations like this often highlight how easily everyday routines—like sharing meals—can turn into sources of tension within families. While the mother-in-law may genuinely believe she is looking out for her daughter-in-law’s health, repeatedly criticizing someone’s diet can create frustration and strain relationships over time.

At the same time, the situation raises another question: when conflicts arise between family members living under the same roof, who should adapt? Should someone change their habits just to keep the peace, or is it reasonable to expect others to respect personal choices—especially when those choices are based on medical advice? What do you think? If you were in this situation, would you adjust your behavior to avoid conflict, or stand your ground in your own home?