I've had chicken breast and broccoli for breakfast. I've had omelets for dinner. Nutritious food isn't time-specific.
BY far the biggest improvement most people could see from a cost basis is learning to cook and then actually cooking. The wife and I cook 2-3 times a week, make enough to last a few days and reheat foods as needed.
BY far the biggest improvement most people could see form a nutritional basis is the removal of food additives and taste enhancers that are designed to make food palatable for consumption while enhancing shelf-life or allowing the use of substitute ingredients that cost less. (Modified food starch, I'm looking at you!)
My point was that she set up breakfast to be a single uniform meal with no variation whatsoever. It was also a high carb meal which is certain to cause an insulin crash later in the day.
I'd much rather see a higher fat/higher protein earlier in the day with some greens, fat, and protein for lunch. Dinner should be a light meal of protein and plant carbs.
Well, this is just an experiment to see if a nutritionally adequate diet can be made for £1 per day.
I hope no-one is going to actually eat it.
I think it could actually be useful if the author increased the amount of money available - say £2 per day. Or if the author did plans for 2 people.