Upon hitting ketosis, there will be signs of positivity physically while internally, it may also have some side effect.
However, the negative side effects is short term and we will have solutions to these minorities.
As the body changes to ketosis, it is also more or less going through a mild detox. Hence, the first thing to do is to flush it out by consuming a lot of water. This will address the Bad Breath, Digestive issues & muscle cramps.
For flu, it will go away if you are able to combat regular sleeping hours by maintain proper exercise to discharge your energy.