What would happen to your body if you only ate 750g of 2% cottage cheese every day for a month?

I target about $400/month for two big kids and two preschool aged kids, and largely manage to hit my target. I shop almost exclusively at Aldi, and our diets are very heavy in dairy, crackers, frozen veggies and involve a weekly taco night and pizza night. Oh and about a dozen or two sandwiches a week.

I often have toast or vanilla yogurt for breakfast and a sandwich for lunch. I've been trying to reduce sugars over the last couple of years (I'm not actually tracking it, but just watching for high values in any processed foods I eat, and making buying decisions partly based on the sugar content)

My budget at the moment is CAD$250 per month. 750g of cottage cheese a month would run me $225 at $7.49 a package. As others have indicated, it's an unhealthily low amount of calories despite it meeting my protein requirements. The only dietary restriction that I need to target is getting enough protein for maintenance of muscle mass. The reasons are twofold: firstly, as I've indicated elsewhere, I have had issues with ED in the past. I fear that losing muscle mass would cause a relapse and I can't afford that at present. More importantly, however, is that my current employment is fairly physical, so I can't afford to get weaker either.

So, to summarize: $250/month, maximizing protein per dollar.

Issues with cottage cheese idea:

• Unfulfilling psychologically
• Potential for malnutrition/health complications
• Extremely low-calorie

Ideas to remedy the situation:

• Cheap carbs (potatoes, flour, pasta/ramen)
• Making things from raw (e.g. milk -> cottage cheese, flour -> bread)
• Cheap meat

I think animal protein needs to be a part of the solution. Tried vegetarianism in the past and I couldn't function well on it. But all animal protein in Canada is expensive, either due to supply management (eggs and dairy), price gouging, supply and demand (e.g. price of chicken breast is ludicrous), or some other unknown factor(s). So plant based protein should also be part of the solution in spite of its lower quality. Others have suggested dried beans/lentils.

It would be worthwhile to make things from raw. I can save roughly a dollar per kg of cottage cheese if I make the cottage cheese myself from milk. I can also use the byproducts in the making of bread, furthering the value and capturing all protein. There will be a significant time cost in doing this.

At the moment we're looking at a diet of homemade cottage cheese, bread, and beans. If I can save enough doing this then I could incorporate vegetables as well, but it might be better to just take a multivitamin and eat the psychological cost. This will only be for a month, potentially two, and hopefully not more. I think I can go that long without becoming too miserable. I'd love to hear some feedback if you have any.

(Bonus solution: find a better paying job.)