If you get 23 people in a room the odds of two of them sharing a birthday are 50%
The birthday paradox is a veridical paradox: it seems wrong at first glance but is, in fact, true. While it may seem surprising that only 23 individuals are required to reach a 50% probability of a shared birthday, this result is made more intuitive by considering that the birthday comparisons will be made between every possible pair of individuals. With 23 individuals, there are (23 × 22)/2 = 253 pairs to consider, far more than half the number of days in a year.
Sugar addiction is not the same as a drug that causes physiologic dependence, like cocaine or opiates.
But
You can become addicted to sugar, or anything that makes you feel good, because you’re basically hacking into the cocaine repository that’s already in your brain. Anything that triggers a hit of dopamine and/or noradrenaline - gambling, shopping, sex, food, weed - can cause addictive behavior, but you’re essentially addicted to your own neurotransmitters and not the thing itself.