If someone eats 1000 calories a day, does that mean you can cut the amount of daily nutrients in half?
Calories and nutrients are not in a fixed ratio. It depends on the nutrient density of the foods you eat. You could eat a sugar laden 3000 calories and get few nutrients. In fact it’s a goal to reduce the calories of low nutrient density diets and maintain the nutrients, thereby achieving a higher nutrient density diet.
No. Please don’t eat a 1000 calorie diet, eating so few calories can only be safely done under medical supervision. A calorie deficit of anything over 25% is potentially dangerous, it’s also extremely unsustainable weight loss and you are just going to end up putting it back on.
RDAs are
> Average daily level of intake sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals
For the macros there is wiggle room (eg you can get to 100% RDA on aminos while not hitting the RDA for protein itself) but the micros generally don’t scale. If you are an adult of x sex the RDAs for micros are the RDAs with not much variance irrespective of how many calories you consume.
You need 90mg of Vitamin C a day if you are an adult male and 75mg if you are an adult female. It doesn’t matter how many calories you eat, this doesn’t change based on the amount of food you eat.
I’d still try to get as close as possible to 100% of the recommended micronutrients still, not just 50%. Regarding macros its really not that important IMO, if you’re working out on the side I’d probably get in a fair bit more protein instead of carbs or fat. Being in such a big deficit is difficult enough, so look what gets you through the day the easiest without neglecting your micros.