There's fat inside our bodies in places you may not be aware of, like the brain, nerves, and surrounding organs. "It is impossible to have zero percent body fat," says Dr. Sutterer.
“Having too little can lead to nutritional deficiencies, electrolyte imbalances and malfunction of the heart, kidney and other organs.” Men require at least 3 percent body fat and women at least 12 percent in order for the body to function properly, Garber said.
It can safely go as low as 10% for women and 3% for men, according to the American College of Sports Medicine (ACSM). With that said, normal body fat percentage ranges that are generally considered healthy for both men and women are provided in the chart below.
At this level of body fat, the muscles, veins, and striations (the rod looking stripes on a muscle) are very visible. This is a very low level and the lowest level of body fat you should have. Two percent body fat is the barest essential minimum needed for organs to properly function.
"It is impossible to have zero percent body fat," says Dr. Sutterer. Guys should have roughly two to five percent of essential fat, he says. It's just not humanly possible to have only 0.33 percent body fat.
Currently, there is no official standard for acceptable body fat percentage values. The American College of Sports Medicine (ACSM) acknowledges a range of 10-22 percent in men and 20-32 percent in women to reduce health risks associated with being underfat or overfat.
Something that most people seem to forget is that fat-free does not mean calorie-free, carbohydrate-free, or preservative-free. What some fat-free products lack in fat, they make up for in sugars and other unhealthy additives.
In reality, 10% body fat means you're already at the point where you have a clearly defined six pack, a properly carved, athletic look, striations in your muscles appearing in some places, and vascularity in the common places as well. Being 10% body fat is VERY, VERY lean.
“A body-fat percentage below 5% is regarded as a warning sign of poor health, even in elite athletes,” says Georgie Fear, R.D., author of Lean Habits for Lifelong Weight Loss.
For people aged 20 to 39, women should aim for 21% to 32% of body fat. Men should have 8% to 19%. For people 40 to 59, women should fall between 23% to 33% and men should fall around 11% to 21%. If you're aged 60 to 79, women should have 24% to 35% body fat and men should have 13% to 24%.
TOO Lean Defined:
Low Body Fat percentage: Under 10% for men and, under 15% for women.
According to this research paper, men who are between 20-40 years old with under 8% body fat are considered “underfat”, whereas a “healthy” range is described as between 8-19%. For women in this same age group, any level under 21% is “underfat” and 21-33% is considered “healthy”.
The medical term for 'skinny fat' is technically MONW or “metabolically obese, normal weight” and “Sarcopenic obesity”. Skinny fat people are often a normal weight (or underweight!) but because of their sedentariness, lack of muscle, or poor diet, they have a high percentage of body fat.
Your body can meet the majority of your calorie requirements from stored fat, but total starvation is fatal in 8-12 weeks, regardless of initial body weight. Within one or two days of your last meal, your body will have exhausted all the glycogen stored in the liver and muscles.
Congenital generalized lipodystrophy is part of a group of related disorders known as lipodystrophies, which are all characterized by a loss of adipose tissue. A shortage of adipose tissue leads to the storage of fat elsewhere in the body, such as in the liver and muscles, which causes serious health problems.
The body fat percentage needed to see your pack of abdominal muscles falls somewhere around 14 to 20% for women and 6 to 13% for men. However, the ideal body fat percentage for abs can look slightly different per person, depending on how you carry weight, where you typically store fat, and your fitness routine.
“Genetically, some people may have more pronounced grooves than others, but you'll notice in the photos of these models, who are very lean, they don't actually have very developed abs,” says Orbeck. “They just have the groove, which means they are leaner than they are stronger in their core.”
Sam Leahey, director of sports science at Precision Sport Science, told Men's Health, These [abs] are not markers of health and wellness. Mortality issues aren't correlated with how many abs you can see in the mirror or the level of skin fold at the abs.
There is more fat all around the body at the 30% level including waist, back, thighs, and calves. The waist looks larger relative to the hips, and the stomach will likely be protruding over the waist noticeably. There is no muscle separation.
As a general rule of thumb, 10 per cent body fat is the safest place to be. You're lean enough to show muscle — including your six-pack — and you can see your veins from your shoulders to your hands, but you're not so shredded that you're becoming translucent.
In general, the total body fat percentage (essential plus storage fat) is between 12% and 15% for young men and between 25% and 28% for young women {Lohman, 1993 #4151} (see also table 13.1). Average percentages body fat for the general population and for various athletes are presented in table 13.2.