I am in Australia. Carnivore Land. I totally share your repulsion for some animal products, I have issues with the smell of eggs and bacon when you enter a cafe in the morning for coffee. You go to an hardware store, they is a sausage sizzle in the carpark, they even have BBQ in the grass strip next to the beaches. The smell is everywhere.
The cheapest Omega 3 index test is performed by Omegaquant . There should be one lab in uk omegaquant.com/shop/ very easy, a prick test done at home. The first time , you could maybe do a fatty acids studies to identify imbalances, the most expensive and then later only the index once a year.
I take 2 gr of EPA-DHA from DEVA algae based .
My 3 kids and DH are not vegan. We usually have the same meal with only a tiny difference. I am from Monaco, so a mix of French and Italian cuisine . We don't usually have the "one pot" meals such as curry, shepherds pies, but a few cooked/raw vegetables, and then for them , there is a steak/fish/chicken ... and I will have some stewed lentils, grilled tofu or whatever. Often, we will have the same, some soups (minestrone, dhal , ...) at least twice a week, polenta with ratatouille, big salads, bruschetta, a risotto, and they will add the cheese in their plate, or a pasta, so many non meat recipes. This red lentils soup recipe is so delicious cooking.nytimes.com/recipes/1016062-red-lentil-soup-with-lemon and uses only 1 cup of red lentils. I double the amount because we are 5 and the kids always have second servings. They add parmesan, I add nothing because I love it as it is.
I use cronometer.com to control my vitamins and minerals intake and in the days I am low on something I either supplement directly or take 1 of the www.thorne.com/products/dp/basic-nutrients-2-day-vm2nc after a while, I know roughly if my day is low or not on something. B12 needs to be 1000ug alternating days. Way more than what you find in a multivitamin, so I have single bottles as well. I take the sublingual methylcobalamin form.
On cronometer you can also check your protein intake and it is even divided by single amino acid ( I restrict my methionine and this is why I avoid animal products) and did I mention it is FREE You might actually consume more protein that you think. However, ideally you should consume 30 gr of protein in one meal for optimal utilisation, preferably in the first half of the day.
I eat roughly 45 gr of proteins a day. Some days less , some days more. Nutritional yeast shoots them up.
The requirements are 0.8 gr/kg of bodyweight until the age of 65. I am quite slim so don't need much.
You shouldn't eat Brazil nuts as a snack. They are incredibly high in selenium, so just a few. I eat only 1. Give your kids almonds, macadamia , walnuts and add just a few Brazil nuts to the bowl to avoid selenium toxicity.
Calcium is important as well, and if you read the vegan book I listed, you will understand that nutrient content in a food doesn't mean nutrient you can absorb, for example spinach are high in calcium but because of the oxalate content, your body can't absorb it. Kale and broccoli are better options. Tofu , especially the one with firming agent calcium sulphate is very high in calcium. (labelled as 509 on packet)
Do you tolerate chickpea flour? You can make a lot of nutrient rich dishes with it. From socca to falafel. Plenty of Lebanese and Israeli recipes. But stay away form lentils/chickpeas chips or snacky food, They are rubbish.
What about edamame? They are the yummiest protein I can think of. A small pot of boiling water, two handfuls of frozen edamame, 6 minutes in water, drain well and when dry , a bit of salt.
I see you eat flax seeds, they are quite high in protein, even if nobody eats 100 gr of them. I have 35gr most mornings. You eat a lot of fruits, so fibre doesn't seem an issue for you. You might want to try chia seeds. I am not a big fan, but once a month, I might have a chia pudding (2 tablespoons chia seeds in a jar, 1 cup almond milk, mix well leave in fridge overnight, next morning, a small pot, add 3 very generous handfuls of frozen raspberries, let it melt and simmer until it looks like marmalade, add to the chia jar. many add some syrup like Marple or rice, I like it tangy)
Your local library should have a decent section on vegan cookbooks and they often include a few chapters on nutrition. Once you understand which nutrient are important, it becomes automatic.
I consulted a dietician before I started to eat a whole food plant based diet, but not for recipes, only for her to review the meal plans I had designed and identify deficiencies.
@RisingMoon Vegan nutrition is not complicated once you know the main principles. If you have gut issues and can't eat large amounts, you need to be smart about what you eat.