There is a long topic further down on this board discussing it, but here is the recipe. There is another recipe in the thread that is for a high calorie sweet bread, which isn't the "diet" one.

HUNZA DIET BREAD RECIPE
Hunza Diet Bread is a delicious, dense, chewy bread that's very
nutritious and is almost impervious to spoilage. The following recipe
makes a huge batch of approximately 60 (sixty) x 2 inch squares, high
in protein, vitamins and minerals.
Keeps weeks at room temperature, even longer in the fridge and
indefinitely in the freezer. The recipe for this wonderful bread is as
follows: -

* 4 cups of water
* 3.5 (three & one half) to 4 pounds of natural buckwheat or millet
flour
* 1.5 (one & one half) cups of canola oil
* 1.5 (one & one half) cups of natural unrefined sugar
* 16 ounces of honey
* 16 ounces of molasses
* 4 ounces of powdered soya milk (half cup)
* 1 teaspoon sea salt
* 1 teaspoon cinnamon
* 1 teaspoon ground nutmeg
* 2 teaspoons baking powder (non aluminium)

Hunza Diet Bread has a taste that is very satisfying and chewy all on
its own, but you may also add if required, apricots, raisins, chopped
walnuts, almonds, sliced dates to the above ingredients. Mix
ingredients. Grease and lightly flour cooking pan(s). Ideally use
baking trays with about 1 inch high sides. Pour batter in pan(s) half
an inch thick over the base. Bake at about 300 degrees farenheit (150
C.) for 1 hour. After cooking, dry the bread in the oven for two (2)
hours at a very low heat - 90 degrees farenheit (50 C). After it is
cooled tip out and cut into approx 2 inch x 2 inch squares. Store it
wrapped in cloth in a container.
You may need to repeat the baking depending on the size of your baking
pan, and oven, until all the mixture has been used.
Hunza Diet Bread is made from natural buckwheat or millet flour. It is
rich in phosphorous, potassium, iron, calcium, manganese and other
minerals, as nothing has been destroyed in the preparation from the
wheat. Thus it contains the essential nourishment of the grain. This is
why you must ONLY use natural buckwheat or millet flour to make your
own Hunza Diet Bread..... Good luck and good health .. bon appetite :-)

Suggestions to lose weight with HUNZA DIET BREAD There are many ways to
do it. This is another benefit. It's flexible. Here are some typical
plans. Each piece of bread is thinly spread with butter for a total of
approximately 100 calories.
Plan A: Eat 1 piece every 5 hours of the 16 hours you're awake. That's
3 pieces which total 300 calories. This is the fastest way to lose
weight I know of. It works faster than any high protein diet. Why? You
have more energy and burn more calories. Second, the high fiber bread
keeps your digestive system regular. Third, your body stays healthy. A
healthy body means a properly functioning metabolic system.
Plan B: Really gorge yourself with the bread. Two pieces every four
hours for a total of 8 pieces but only 800 calories. You'll feel full
all day. In fact, I doubt many people could eat this much of the bread.

Plan C: Eat a piece in the morning for breakfast and a piece 3 hours
before your dinner and you will eat a great deal less.
Plan D: Eat a piece of HUNZA DIET BREAD, 10 minutes before you eat your
regular meal. When we do this we eat only a fraction, such as 1/4 of
what we would normally eat. If we wait longer than 10 minutes we don't
want to eat at all.
Plan E: Eat the bread at the end of meals that don't fill you up
enough, such as low calorie meals. This is a perfect way to use the
bread. You eat a low calorie meal, enjoy it, then eat a piece or two of
bread to fill you up. Perfect! No suffering and no urge to snack.
Plan F: Alternate Plan A, B, C, D. We recommend an alternation of the
plans, but some people who just want to get the weight off as soon as
possible will use Plan A exclusively.