I was told the same last May, after losing a stone and a half due to stress/anxiety + having absolutely no appetite -weird for me as always loved cooking + resultant grub! With the help +sound advice of a “food scientist” + finding food I wanted to eat, gradually increased my weight from 8 stone to 9 and a half….But it took about 5 months of patience, very gradual weight gain each week when we had a “weigh in” at home,eating when I couldn’t face it + my husband making sure I ate! It helped to keep a food diary too, to roughly estimate calories. Food planning helped too.
My GP said eat proper food with only the occasional treat (which went against NHS dietitian advice, but our GP is a mega fit lady who runs etc + looks after herself!)
Stuff which helped:
Smoothies made with cream/full fat milk or coconut milk, avocado, banana, coconut oil, flaxseeds, almond or peanut butter, berries, ice cubes, full fat Greek yogurt. Lots of recipes online.
2nd or 3rd breakfasts – used to have a smoothie 1st thing, then 2 fried eggs or plateful of scrambled eggs from works canteen, then maybe toast too or bowlful of porridge or as a treat, Canadian pancakes from a brill cafe where we live.
Drinks – use full fat milk in coffee, tea, drink full fat milk if you can! Also bought a juicer to get more good stuff in system with eating + chucked stuff in it like spinach, kale, apples, ginger, celery, cucumbers – loadsa recipes online.
Grazing – spoonfuls of nut butter during day, anything calorific on crackers = cheese, avocado, nut butter + cottage cheese, generously buttered toast 🙂 , little snack bags of nuts+ very dark chocolate+ dried fruit, full fat natural yoghurts. Having several small meals a day.
Extra calories in main meals – mashed sweet spuds with butter + cream – same for mashed cauliflower, using a decent stock + extra butter + cream in soups, eating rib eye steak (treat, obviously!) Adding cream to sauces etc, homemade rice pudding…Nommmm.
Look online for interesting recipes – spent a while looking at paleo + healthy food blogs for recipes, which was useful to get inspiration. Started baking stuff with almond flour, used avocados – nice pud = avocado+banana+cacoa powder, fridge it +it’s kind of like a choc mousse!
Sugar doesn’t work for me, so it was important to have decent protein+ good fats. However, love very dark chocolate+ that helped! I was referred to see an NHS dietitian, who work within their guidelines. However, they recommended stuff like fig rolls, Mars bars, sugary stuff which would’ve only resulted in putting on fat + me hating food! I did look at powdered shakes such as complan, but they’re rammed full of cr*p, sugar + you’re better off making your own.
Hmm, that’s some waffle! Hope your wife manages to gain weight healthily, she’ll feel better for it 🙂 Good lucks x