There was a famine at the end of the war and it wasn't so disastrous for them. IMO it will be whoever runs out of some important raw material first that is necessary for industry, they will be the loser. That or someone runs out of manpower. Edit. Like chromium ore which I think the USSR had plenty of assuming Turkey stops sending it to Germany.
Turkey did this because of threats by the Allies and Germany was being pushed back in 1944 and the writing was on the wall.
Also, Germany'a debt was out of control and would have been ~500 billion RM in 1945 had the war continued.
The situation was very dangerous during the war, with a large die off due to malnutrition running from 1943 to 1944. Allow me to share some sources:
The Bread of Affliction: The Food Supply in the USSR during World War II, by William Moskoff -
"The central fact behind the increased importance of the collective farm market was the drastic drop in food production, especially in 1942 and 1943, and the diminished proportion that went to the civilians. In 1943 overall agricultural production was only 38 percent of the 1940 level. In 1943, however, the Red Army began to recapture agricultural areas of the Ukraine, Belorussia, and the Caucasus and by the next year, 1944, agricultural output had risen to 54 percent of the 1940 level. Not surprisingly, the collapse of the food economy led to astonishing increases in prices. The most rapid
rate [Emphasis by author] of increase in prices took place in 1942 and began to taper off in mid-1943."
The Soviet Economy and the Red Army, 1930-1945, by Walter Scott Dunn
-
"By November of 1941, 47% of Soviet cropland was in German hands. The Germans had 38% of the grain farmland, 84% of the sugar land, 38% of the area devoted to beef and dairy cattle, and 60% of the land used to produce hogs. The Russians turned to the east and brought more land into cultivation. In the fall of 1941, the autumn and winter crops increased sharply in the eastern area. But despite all efforts, farm yields dropped from 95.5 million tons of grain in 1940 to 29.7 million tons in 1942. Production of cattle and horses dropped to less than half of prewar levels and hogs to one fifth. By 1942, meat and dairy production shrank to half the 1940 total and sugar to only 5%. Farm production in 1942 and 1943 dropped to 38% and 37% of 1940 totals."
Another good resource is
Hunger and War: Food Provisioning in the Soviet Union during World War II by Wendy Z. Goldman and Donald A. Filtzer. It goes into great detail as to how bad the situation was, and directly states it was only because of Lend-Lease did the Red Army not starve.