Most people in US do genetic testing to know their lineage (%dutch, %native american etc) and identify lost relatives/cousins. Those motivations don’t apply to India and data too doesn’t exist that well.
If your motivation is around wellness (diet, exercise etc); then the research is weak and most inferences they show can be self-fulfilling or inactionable for average joe. Might be relevant for athletes etc.
If your motivation is around rare diseases (single gene mutation leads to a disease/syndrome), you will get high confidence results but its a rare and unless you have family history / indicative symptoms not useful for adults.
For lifestyle diseases like Diabetes, Heart Conditions etc; there is a bit of research but its very indicative. Instead of genetic testing, you might as well look at both sides of your family for risk and your own lifestyle to judge the risk.
A colleague and I have done DNA tests for ourselves as part of product category evaluation back in 2019. We felt indifferent and didn’t change one thing in our lives post that. A well known founder does DNA testing every year to see progress the field is making and he too is of opinion that actionable insights for an average person is weak and not worth the cost you pay.
So who needs to get genetic testing done?
• Prenatal fetus
• New borns
• Folks with family history of rare diseases
• Folks with indicative symptoms of rare diseases
• Targeting genetic testing for a particular disease or treatment protocol (which drug might work for you with strong research)
• Ethnicity Data (for well studied population)
• You have money to spare to satiate your curiosity
• You want raw DNA data (Saurabh’s motivation I guess) for future use / optionality. You can check this data against latest research
Genetic testing is expensive unless your order is given in bulk to a lab. Very less wellness research is done on Indian population due to cost factors. Your data might be sold by these companies for research purposes. Your data can be requested by govt authorities in future (in US this happens already).
Sorry for the long post. Spent sometime on this space 3 years back. Read The Gene by Siddharth Mukherjee to understand the promise and uncertainty in this field.