Move Most Days, Eat Mostly Food

Add before you subtract.
Every eating plan you've ever quit started the same way: a list of what you're not allowed to have. This guide doesn't have one. There are no forbidden foods here, just a long list of great ones and a simple strategy: get more of these, and let them crowd out the rest.
That's the whole trick. Nobody white-knuckles their way to health. You just fill the cart, the plate, and the day with enough good stuff that the other stuff stops running the show.
Movement, first
The bar is both lower and higher than the fitness industry wants you to believe. Lower, because a 30 minute walk outside counts completely. It is not the warm-up for real exercise. It is real exercise, and doing it daily beats almost any program you'll abandon by March.
Higher, because walking alone doesn't hold onto muscle and bone, and past 30, you're losing both by default unless you push against something heavy a couple times a week. Strength training is the single most underrated thing on this site, especially for women. Your future bones are built now.
The tiebreaker for everything else: pick what you'll actually show up for. A hike, a dance class, a bike ride with a friend. Consistency beats intensity every time they compete.
Food, the two anchors
Before the list, two anchors that do most of the work. Protein at every meal, in the range of 30 to 40 grams, because it keeps you full, holds onto muscle, and quietly fixes the 3pm snack spiral. And plants at every meal, because fiber is the most boring word in nutrition and the most reliably effective one.
The pairing trick
One nurse note worth the whole page: iron from plants absorbs badly on its own and dramatically better with vitamin C. So pair them on purpose. Lentil soup with tomatoes and a squeeze of lemon. Spinach salad with strawberries. Black beans with bell peppers. Same groceries, better math.
The list. Get more of these:
Proteineggs, grass-fed beef, turkey, chicken breast, salmon, tuna, shrimp, Greek yogurt, cottage cheese, ricotta, kefir, firm tofu, edamame, lentils, black beans, kidney beans, chickpeas
Iron, and its vitamin C partnersiron from beef, turkey, salmon, tuna, lentils, beans, spinach, pumpkin seeds. Vitamin C from oranges, strawberries, kiwi, mango, pineapple, papaya, guava, tomatoes, bell peppers
Produceall berries, cherries, bananas, dried figs, avocado, sweet potatoes, broccolini, brussels sprouts, cabbage, collards, spinach, carrots, beets, onions, garlic, ginger, mushrooms, asparagus, green beans, peas, squash, cucumber, artichokes, eggplant, turnips, olives, fresh herbs
Nuts and seedsBrazil nuts, walnuts, almonds, cashews, pistachios, pumpkin seeds, sunflower seeds, hemp seeds, chia, flaxseed, sesame seeds, peanut butter, almond butter
Grains and starchesoatmeal, quinoa, brown rice, sourdough, sprouted bread, green plantain
Fermented thingssauerkraut, kimchi, miso, kefir, yogurt, kombucha, pickles
Pantry upgradesolive oil, coconut milk, apple cider vinegar, nutritional yeast, turmeric, iodized salt, seaweed snacks, raw honey, bee pollen, cacao nibs, dark chocolate over 72%
Fiberchia, flax, oats, beans, and psyllium husk, which has its own entry in Supplement Basics worth reading before you buy
Print the list, screenshot it, tape it to the fridge. When most of your cart comes from it, you've handled Tier 2, and you did it without a single food rule. Get more of these. Balance out the others. That's the entire program.
Nurse Ann