News flash: Not everyone has to eat the same thing. It helps to understand this before anyone in the household sets out to make dietary changes of any kind. Changing what you eat is hard enough. Adding power struggles between household members can only make it harder. When you decide that you want to take ownership of your body and make positive changes, this will immediately change the power dynamic. Others around you will get nervous and try to restore equilibrium by pushing back and trying to making you quit. It is known. Plan around them. This is also true if you're the one who wants snacks and someone else is trying to change. The only rules are the rules that work for everyone concerned.
Power struggles come in every variety. You can have a power struggle about who goes to bed when, who gets to use which bathroom for how long at what time of day, who unloads the dishwasher, who cleans up cat barf, who gets to spend how much money on what, and on and on. You can make every single thing a power struggle every day if you like. If you have children, you can have power struggles with them about whether the left shoe goes on the left or right foot, whether you can wear the same outfit after it technically no longer fits, or how many times to reread the same storybook. A popular child-oriented power struggle is whether one needs to eat any foods that contain insoluble dietary fiber or micronutrients, or whether one can simply get rickets or pellagra instead. Look at the snacks/diet plan spectrum as a non-binary, non-zero-sum choice in the context of power struggles in general.
Non-binary means there are more than two options. Non-zero-sum means there can be multiple winners. For example, if I wear a t-shirt, everyone else can also wear a t-shirt, or a sweater, or a T-Rex costume, or whatever. It only becomes an issue if I'm trying to enforce a dorky dress code on a family photo.
That's the thing about food intake. In our culture, apparently anything other than 24/7 cheese-covered deep-fried super-sized buffet is preachy and body-shaming.
There is food everywhere. If you haven't noticed yet, you're going to. Vending machines! Candy bowls! Free breadsticks and chips and salsa! Ice cream trucks! Restaurant delivery! All-night drive-thru! You can get pizza delivery by drone on two continents already. I anticipate 3D-printed food on demand, just like Star Trek, in only a few years. Before we know it, we're going to be accosted by little R2-D2-type robots trying to give us free samples and take our orders for third breakfast, second lunch, and eighthsnack. Drones can fly through our windows and drop food bundles straight down our funnels, directly into the esophagus. It'll be great.
Things changed for me when I realized how deep my scarcity mindset went around food. I had spent at least four minutes chasing a single pumpkin seed around my plate, trying to get it on my fork. I froze. I asked my husband, "How long have I been doing this?" He said, "As long as I've known you." I had this rule somewhere in my psyche that I had to absorb every single molecule of food that had been served to me. I sat with this feeling. I taught myself that because I have 24-hour access to all foods known, I can relax. I will not starve. In fact, if I got anywhere within 40 pounds of starving, a committee would chase me down, wearing matching hats that read GIRL, EAT A SANDWICH, and would in fact force-feed me sandwiches until I reached the new zaftig ideal. I don't have to have food in my mouth during every waking moment, and it turns out my dentist agrees.
I lost 35 pounds, and I haven't had a migraine in over three years. I'm never going back.
My husband has struggled with his weight all his life. His top weight was 305. He taught me everything I know about weight loss, and the irony of this is that we're never trying to lose weight at the same time. I've learned that to support him when he's on a mission, I simply can't eat certain things in front of him, or store them where he will see them. When I was training for my marathon and he was cutting calories, I had: first and second breakfast, first and second lunch, afternoon snack, Frappy Hour, and of course my fanny pack o' fig bars and trail mix for the run itself. I had a secret container of Birthday Cake Oreos hidden in my office. I bought Nutter Butters because he doesn't like them. (Neither do I, but COOKIES). We ate a sensible dinner together after he got home, and if I wanted late-night snacks, I would just stuff them in my pocket when he wasn't looking and "go for a walk." I do everything I can to be courteous and supportive around his eating plans, just as I would for any of his other plans.
A strategy that was helpful for me, when I was untraining myself from EATING ALL THE THINGS, was to remember the grossness of some former coworkers. People be touching the snacks. There was this one guy my husband referred to as "Mister Poopy Hands" because he had seen him walk out of the restroom many times without ever going near the sinks. I never ate out of communal office bowls ever again. If there's something I want to not eat, I just picture that particular dude scrabbling around in the bowl or working in the kitchen. Bleah.
The truth is that nobody is responsible for what goes into my mouth but me. I just make a decision and then the decision is made. If I'm going to eat cake for breakfast, so be it, the Word has been spoken. If I decide to trim the four pounds I gained over Thanksgiving weekend, so be it, the Word has been spoken. If I struggle and resist Past Self's policy choices, I can give myself R. Lee Ermey-style coaching or I can wear a thick rubber band around my wrist and snap myself. I can remind myself that I'll be at my goal in a few more days. What I can do for anyone other than myself is significantly more limited.
Good luck ever trying to change anyone else's eating habits. Good luck ever trying to change anything about anyone. The very fact that your intention has become obvious sabotages any chance of a positive result. Assuming the mantle of Nutritional Gatekeeper is nuanced and complicated. It does tend to work on children, though, because they don't have money, they can't drive, and they generally can't cook, either. What your kids eat, if you have children, IS entirely up to you. Just because they demand nutrient-free foods does not mean you have to provide them.
Scarcity mindset will poison your best attempts, whether for yourself or others. Put joy back into your life, there and in other areas. More good stuff. More music, more color, more nature, more laughing, more making of things rather than consuming of things, more hugging, more fascination. If food is the highlight of your day, then you have a devastatingly boring life. Find a way to make your life more interesting and pleasure-filled overall. This may have a ripple effect on the people closest to you, changing the power dynamic, or it may not. What you eat can't really be about what everyone else eats. Do what works for you, and it will work for you.
I've been working with chronic disorganization, squalor, and hoarding for over 20 years. I'm also a marathon runner who was diagnosed with fibromyalgia and thyroid disease 17 years ago.