I'm not sure if you're being sarcastic and pointing out that anything is "toxic" in high quantities. In case you aren't, or for people that did not catch it, 29g/kg is about 2.4kg of sugar for the average 80kg male, which comes out to about 12.5 cups or 3 liters. It should be obvious to most people that filling a two-liter bottle with pure granulated sugar and consuming it in one sitting would have severe health consequences (if you can even manage to get it all down).
What's probably toxic about it at this dosage is that it cannot be eliminated by your kidneys or stored in your liver quickly enough, so it accumulates in the blood and shifts the osmolality causing neurological symptoms, osmotic diuresis and cardiac arrhythmia.
I was being sarcastic. But I also wanted to post to point to the fact that scientists believe that 50% of the people who ate this much sugar would in fact survive!
I was severely depressed a month or two ago, and I went ahead and bought two 2 pound chocolate rich cakes in succession and ate them over a period of 24 hours. Though it didn't kill me, but it was definitely not too upsetting. I still have the urge to just eat huge quantities of sugar, and I am not sure how to control it, but yea it definitely did not kill me or make me sick.
I am otherwise an extremely fit individual (can run 5k in 16 minutes)
Incidentally there are some studies with rats showing that sugar/sweet addicted + cocaine addicted rats prefer their sugar hit over their cocaine hit, and plain sugar-addicted rats when removed from sugar/sweet had opiate-withdrawal like symptoms.
Eating sweets does improve mood. There are several known mechanisms. e.g., carbs facilitate amino acid transport across the blood-brain barrier [1], and wheat stimulates endogenous opiate receptors [2]. But, if you want to influence brain chemistry therapeutically, eating sweets is probably not the best approach. Good luck!
It surprises me that such a comparatively small amount of sugar could be fatal, or even have severe health consequences. I wouldn't have thought it would be healthy but I wouldn't have expected immediate death as a likely outcome.
What's probably toxic about it at this dosage is that it cannot be eliminated by your kidneys or stored in your liver quickly enough, so it accumulates in the blood and shifts the osmolality causing neurological symptoms, osmotic diuresis and cardiac arrhythmia.