People are sure about the return from an investment. However we were able to experience massive losses on some occasions which were completely unexpected. So, investment too kind of gamble. You'll invest today with the expectation to eat tomorrow, but you won't get the food. In such situation what can be done. For two days you weren't able to feed yourself, the next day your mind won't function perfectly to analyse the market. So, the importance of food is high than an investment.
That is why if you have spare money, that is the time you'll invest, not investing first before your basic needs because you are right, and on the 4th day for sure, you'll be unable to stand up and continue your daily routine because you prioritize investment over food. As others said, we should not always chase money; we should also take care of our needs because what will you do with your money if you are now buried? Make it balanced, eat healthy foods, and at the same time, try to analyze where you are going to invest.