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I'm no longer ravenous. I'll no longer eat until I fall asleep.

The Hunger Game, a new five-part series exploring the meteoric rise of weight loss drugs.

It's been an incredible story with these drugs.

The uptake, the amount of product that's been sold, the amounts of money

is cost. What the drugs do, how they work, and the knock-on effects of their widespread use.

We'll be sitting here in three years time going, oh, it caused problems that we're now going to have to fix.

The Hunger Game with me, Professor Gilesio. Listen first on BBC Sounds.

In this edition, we're travelling to Southeast Asia

and one of the world's great biodiversity hotspots, the Philippines,

in search of surprising and fascinating stories of endangered foods,

including a unique marine species found in only one place on earth.

We have a small fish found in the lake of Ta'al, where there's a volcano.

Ta'al is just south of Minnala, and in 1754, an eruption from a nearby volcano was so violent and so prolonged that lava flowed for six months.

Where there had once been a bay that faced out to the South China Sea, a barrier of molten rock created an enclosed lake.

And over centuries, the trapwater changed from being salty to sweet. It is a freshwater lake that used to be part of the ocean,

and the fish got entrapped in this lake.

The fish, 15 cm long scientific name, Sardinella Toilis, is the only known fresh water

sardine found anywhere in the world, or the result of an explosive geological event in the Philippines

300 years ago.

And to this day, that fish is only found in Taal Lake.

And people go to have this fish because it's found nowhere else.

...