During Insta Keto a three day period, you will consume all the water-packed tuna you desire while drinking as much water as humanly possible. Will you lose weight fast? Yes. Will you be able to keep it off? Very unlikely. If your only goal is to get into an outfit for a special occasion, then this would probably work but this “diet” is definitely not something you could sustain long-term for any length of time. One of the major health problems facing our society today is the problem leptitox of obesity.