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This idea is both food waste and cost effective, it’s a good way of hitting two areas that require aid.
It effects food waste by encouraging restaurants to serve smaller portions depending on the person. The smaller portions will result in multiple positive effects on people and the food industry.
However, the major problem in this system is, how will you get people to eat at these restaurants and how will you get bigger corporation restaurants to change portions for the certificates.
I would encourage people to eat at the restaurants that are awarded certificates discount like system. If a person eats at a location that has acquired the certificate and has the meal in accordance with the certificates regulations they get reward points. They can then use the points to get a free meal if they so choose from any location with a meal that meets the certificates requirements. As a result, people are rewarded for eating certain meals in certain places.
As for getting bigger companies involved, I would negotiate with them about various foods they would be willing to change as well as implementing a similar rewards system as referenced earlier.
I wish you the best of luck and I hope all goes well with your program.

Your idea has a different approach, and a good one at that. The use of leftover bread to make beer appears to be an effective way to reuse the wasted grain. However, logistics for distribution are apparent and the ability to expand your horizons appear limited. The logistics being the more important of the two.
The problem I see in the logistics is distribution. It’s not even a problem necessarily but rather a recommendation. If your company is to expand, I would begin finding small local locations to partner with. Then sell your stock on the shelf and get feedback from the masses. The solution to distribution the stock would be looking into the use of big brand transport trucks for drinks.
This will have a positive impact of on multiple parts of your system. It will allow for the feedback to be taken into account for a better brew. On top of that, the wider distribution of the stock would cause word of your stock to increase. In addition it would have a positive effect on marketing and sales.
The next problem of your system is that you are isolated the use of bread. This can lead to a very plain tasting stock that may get distasteful quickly. To resolve this I would begin to look into other methods of brewing leftover stock from farms. Possibly drying out fruits or vegie and creating a brew from the composite might work.
I will be looking forward to seeing how things develop and expand, best of luck

The idea of using leftover food from farms is a simple straightforward idea. However there are problems as you have stated. These problems being logistics, supply and demand, quality of goods and safety of the goods. The most prominent of these is supply and demand.
Supply and Demand is the back bone of this idea. If the supply and demand is not dealt with early, how will you know where to distribute the stock? I suggest creating a system that would start in a wide radius within your area of operations. Pinpoint places where your stock can be sold and re-used. Approach these places and find an arrangement where they get the proper amount of stock when they deem it necessary. From this point, look at your farms and how they produce stock. What farm produces more of this and how will you get the stock from point A to B.
After having your supply and demand dynamic for your stock, the next thing to tackle would be the logistics of the stock. The logistics are important because it directly correlates to supply and demand. It would be wise to find a way of transporting the stock. I recommend a box truck. However, use of trucks means taking fuel, maintenance, registration, etc. into account. Depending on how the logistics are set up, plan accordingly. If the logistics are setup in a way that allows full coverage of your clients the goal will have been achieved. This results in the systems having a positive effect on each other when they work in conjunction.
The execution of these two problems must be done first. If your idea is to move forward action must be taken now.